A parse tree is a hierarchical structure that represents the syntactic structure of a sentence or expression in a formal language. It is used in natural language processing and compilers to analyze and understand the grammar of a language.
To show that w has a parse tree with n + m nodes, we can use induction on m, the number of steps in the derivation of w.
Base case: If m = 0, then w is a starting symbol of G and has a parse tree with only one node, which is w itself. Therefore, the number of nodes in the parse tree is n + 0 = n.
Inductive step: Assume that for any derivation of length k < m, any string in L(G) with length n has a parse tree with n + k nodes.
Let S be the starting symbol of G and let w be a string in L(G) with length n that has a derivation of m steps. Let the last production used in the derivation be A -> x, where A is a nonterminal symbol and x is a string of terminals and/or nonterminals.
Since G has no productions with € on the right side, x cannot be €. Therefore, x has at least one symbol in it. Let that symbol be B, which is the leftmost nonterminal in x. Then we can write x as x = yBz, where y and z are strings of terminals and/or nonterminals and B -> y is a production in G.
We can construct a parse tree for w as follows:
1. The root of the parse tree is the starting symbol S.
2. The children of S are the nonterminal symbols in the first production used in the derivation of w, which is S -> x. Therefore, the children of S are x's symbols, which are yBz.
3. The left child of S is a subtree that corresponds to the derivation of y. By the inductive hypothesis, this subtree has y nodes.
4. The right child of S is a subtree that corresponds to the derivation of Bz. This subtree has m-1 steps, since it is the remainder of the derivation of w after the first step. By the inductive hypothesis, this subtree has |Bz| + (m-1) nodes.
5. The left child of yBz is a subtree that corresponds to the derivation of y. By the inductive hypothesis, this subtree has y nodes.
6. The right child of yBz is a subtree that corresponds to the derivation of Bz. This subtree has m-1 steps, since it is the remainder of the derivation of w after the first step. By the inductive hypothesis, this subtree has |Bz| + (m-1) nodes.
Therefore, the parse tree for w has n + m nodes, since it has one node for each symbol in w and one node for each step in its derivation.
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What guidelines should you follow prior to ordering and installing memory in an hp business pc or notebook?
In computer, the guidelines that should be followed prior to ordering and installing memory in an hp business pc or notebook is to verify that the network cable is plugged in.
What is computer?It should be noted that a computer simply means the electronic device that can be used to make one's work easier.
In this case, in computer, the guidelines that should be followed prior to ordering and installing memory in an hp business pc or notebook is to verify that the network cable is plugged in. This is important to allow for easy installation.
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Which of the following protocols is used by an email client to retrieve messages from an email server, giving users the option to keep mail messages on the server
IMAP protocols is used by an email client to retrieve messages from an email server, giving users the option to keep mail messages on the server.
What is IMAP on one's email account?IMAP is a term that connote Internet Message Access Protocol. IMAP helps one to be able to access the same inbox from a lot of devices.
Hence, IMAP protocols is used by an email client to retrieve messages from an email server, giving users the option to keep mail messages on the server.
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In a typical office, biometric authentication might be used to control access to employees and registered visitors only. We know the system will have some false negatives, some employees falsely denied access, so we need a human override, someone who can examine the employee and allow access in spite of the failed authentication. Thus, we need a human guard at the door to handle problems as well as the authentication device; without biometrics, we would have had just the guard. Consequently, we have the same number of personnel with or without biometrics, plus we have the added cost to acquire and maintain the biometrics system. Explain the security advantage in this situation that justifies the extra expense.
The security advantage in this situation that justifies the extra expense is that these Biometric devices is one that separates the handling of issues regarding biometric information from the system operating system.
It is one that render it impossible for hackers to alter the authentication process.What is the aim of biometric authentication?An biometric authentication is known to be a device that is used to handle access in regards to physical and digital resources, e.g. buildings, rooms and other forms of computing devices.
Note that the security advantage in this situation that justifies the extra expense is that these Biometric devices is one that separates the handling of issues regarding biometric information from the system operating system.
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The ____ file is typically saved with a prefix of inc_.
a. insert
b. include
c. nested
d. increment
The include file is typically saved with a prefix of inc_.
What is include file?The include (or require ) statement is known to be one that often takes the total text/code/markup that is seen in the specified file and it is one that copies it into a given file that uses what we call the include statement.
A file is known to be any form of documents and it is one that can be in any format such as pdf, doc and others.
Hence, in the case above, The include file is typically saved with a prefix of inc_ as that is the way to save it.
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Password complexity, password history, and password reuse are all examples of what?
Password complexity, password history, and password reuse are all examples of account policies.
What are Account policies?This refers to the document which contains the requirements necessary for maintaining or creating an account on computer systems or networks.
These policies vary from password complexity to avoid accounts being compromised to password history so as to be able to recover passwords on the system. This is achieved by the use of unique letters and numbers which are difficult to access by a third party thereby making it the most appropriate choice.
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Which mynav module serves as the source for sales and delivery content, assets, and intellectual property across industries??
possible answers (only one right):
a) industry module
b) cloud advisor
c) green cloud module
d) talent advisor
The Industry Module of the mynav module serves as the source for sales and delivery content, assets, and intellectual property across industries.
What is industry module myNav?myNav is known to be one that simulates how a given solutions will act at scale, and it also validates it's the right in regards to fitting in for the first time.
Hence, The Industry Module of the mynav module serves as the source for sales and delivery content, assets, and intellectual property across industries.
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which of the following is required to establish a new network switch and configure its IP address for the first time
Out-of-band management is required to establish a new network switch and configure its IP address for the first time.
What is Out-of-Band management?Out-of-Band management is known to be a form of services that makes sure that a tech do not require to be sent onsite and it is one where remediation can be done in a remote place.
Hence, Out-of-band management is required to establish a new network switch and configure its IP address for the first time.
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Which of the following is required to establish a new network switch and configure its IP address for the first time?
A. Client-to-site VPN
B. Site-to-site VPN
C. Out-of-band management
D. In-band management
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Write a while loop that prints user_num divided by 2 until user_num is less than 1. The value of user_num changes inside of the loop.
Answer:
user_num >= 1
while true do
print "user_num/2"
Explanation:
First, you write that the user_num is equal to or is greater than 1. Then you write in the while loop that while that's true, print user_num divided by two.
You are working for a large financial institution and preparing for disaster recovery and upcoming DR drills. A key component in the DR plan will be the MySQL database instances and their data. The Recovery Time Objective (RTO) is such that read replicas can be used to offload read traffic from the master database. Which items are key features of read replicas
The items that are key features of reading replicas are
inside AZ, across AZ, or even beyond the area - may establish RRAn individual database server instance was manually elevated to stand-alone statusEach RR with its own DNS destination may have up to five RRs per master.This is further explained below.
What is the DR plan?Generally, A disaster recovery plan, often known as a DRP, is a well-documented and organized strategy that outlines how an organization may swiftly go back to work in the aftermath of an unexpected event.
In conclusion, A disaster recovery plan, also known as a DR plan, is a formal document that is drafted by an organization and provides step-by-step instructions on how to react to unanticipated occurrences such as natural disasters, power outages, cyber-attacks, and any other kind of event that is disruptive.
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A developer created a helper class with a method that can be called from Visualforce pages, web services, triggers, and of even anonymous code. When the method is called from a trigger
Since the developer created a helper class with a method that can be called from Visualforce pages, the method is as a result of a trigger known as option A. Check if Trigger.isExecuting ==true.
Who is a system developer?A systems developer is known to be one among the type of software developer.
Note that they are known to be the person that is said to be responsible as they help to create and implement applications and programs for the backend processing systems that is said to be often used in regards to businesses and organizations.
Note that Backend processing systems are said to be a behind-the-scenes aspect of software and as such, Since the developer created a helper class with a method that can be called from Visualforce pages, the method is as a result of a trigger known as option A. Check if Trigger.isExecuting ==true.
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A developer created a helper class with a method that can be called from Visualforce pages, web services, triggers, and of even anonymous code. When the method is called from a trigger, the developer needs to execute logic that should not be executed If the method Is called from anywhere else. How can the developer determine if the code Is executed in a trigger context?
A. Check if Trigger.isExecuting ==true
B. Check if Trigger.newMap !=null.
C. Check if System.executionContext =='Trigger'.
D. Use the executeOnTrigger annotation on the method definition.
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You want to make sure that all users have passwords over eight characters in length and that passwords must be changed every 30 days. What should you do
Answer:
Configure account policies in Group policy.
Explanation:
When starbucks sells its coffee and mugs to the public on its website, it is a ________ sale.
When a business firm such as Starbucks sells its products (coffee and mugs) to the general public on its website, it is a B2C sale.
What is B2C?B2C is a business model which literally means business to consumer and it can be defined as a market which involves businesses selling their products and services directly to the end consumers for their personal use, usually over a website.
In this context, we can infer and logically deduce that when a business firm such as Starbucks sells its products (coffee and mugs) to the general public on its website, it is a B2C sale.
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Where does customer information, such as news articles, videos, large amounts of text, images, or audio files, generally get stored for web services?
The place where the customer information, such as news articles, videos, large amounts of text, images, or audio files, generally get stored for web services is the database.
What is database?It should be noted that the database is a collection of structured information or data that are stored in the electronic system.
In this case, the place where the customer information, such as news articles, videos, large amounts of text, images, or audio files, generally get stored for web services is the database. It is conteolled by the database management system.
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Which web 2.0 feature utilizes application programming interfaces (apis) to automate web content and/or processes?
Software as a service (SaaS) is known to be web 2.0 feature that utilizes application programming interfaces (apis) to automate web content and/or processes.
What is SaaS?SaaS, or software as a service, is known to be a kind of an on-demand access that is said to be often in a ready-to-use format and it is also a cloud-hosted application software.
Note that Software as a service (SaaS) is known to be web 2.0 feature that utilizes application programming interfaces (apis) to automate web content and/or processes.
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You have downloaded a file from the internet. You generate a hash and check it against the original file's hash to ensure the file has not been changed. Which information security goal is this an example of
Answer:
integrity
Explanation:
Which selection tool should be used to fill a vacancy that requires managing multiple priorities and working under pressure
The selection tool that should be used to fill a vacancy that requires managing multiple priorities and working under pressure is Behavioral Assessment.
Why is behavioral assessment vital?Behavioral assessment is known to be that which helps us as humans to be able to look at how a person does their work and gains or get their objectives.
Therefore, The selection tool that should be used to fill a vacancy that requires managing multiple priorities and working under pressure is Behavioral Assessment because this is what it is.
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Which selection tool should be used to fill a vacancy that requires managing multiple priorities and working under pressure?
A. Cognitive Ability Test
B. Background Check
C. Behavioral Assessment
D. Academic Transcript
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What type of email communication reaches out to former clients and older prospects and encourages a reply? Strategic email Onboarding email Reengagement email Promotional email
A type of email communication that reaches out to former clients and older prospects and encourages a reply is: C. reengagement email.
What is an e-mail?An e-mail is an acronym for electronic mail and it can be defined as a software application (program) that is designed and developed to enable users send and receive both texts and multimedia messages over the Internet.
In Computer Networking, a reengagement email is a type of email communication that is designed and developed to reach out to former clients and older prospects, and it encourages a reply.
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In the context of customer relationship management (CRM) applications, which approach is often chosen by organizations with an established IT infrastructure
The on-premise approach is often chosen by organizations with an established IT infrastructure.
What is the On Premises?In an on-premises method, resources are said to be given or deployed in-house and it is one that is found within an enterprise's IT infrastructure.
Customer relationship management (CRM) is known to be a form of a technology that is often used in the act of managing all of a firm's relationships and communications with customers and also that of potential customers.
Therefore, The on-premise approach is often chosen by organizations with an established IT infrastructure.
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What technique is most commonly associated with the use of malicious flash drives by penetration testers
Answer: Distributing malicious flash drives in a parking lot or other high-traffic area, often with a label that will tempt the person who finds it into plugging it in, is a technique used by penetration testers.
Explanation:
Whose email address may the agent enter into the applicant information section of LEAN enrollment application
It is the customer's email address may be entered into the applicant information section of LEAN enrollment application
What is LEAN enrollment application?LEAN enrollment application is a kind of electronic enrollment program which is specifically designed to make enrollments easier for agent
So therefore, It is the customer's email address which may be entered into the applicant information section of LEAN enrollment application
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Header file guards are preprocessor directives whose primary role is to cause the compiler to _____
Header file guards are preprocessor directives with the primary role to cause the compiler to allow defining a function that are usable throughout a user's program.
What is a header file?A header file can be defined as a type of file which comprises macro definitions and C declarations and they are meant to be shared between several source files.
In Computer programming, header file guards are preprocessor directives with the primary role to cause the compiler to allow defining a function that are usable throughout a user's program.
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The telephone system is an example of a ________ network
The telephone system is an example of a circuit-switched network.
Is telephone a circuit switched network?Yes. The Traditional telephone systems such as landlines are known to be a common example of a technology that are said to often make use of the circuit switching.
Hence, The telephone system is an example of a circuit-switched network is a true statement.
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Lucy is trying to decide what sources to use in her literature review. The type of sources Lucy will use in her literature review will depend on which of the following?
The type of sources Lucy will use in her literature review will depend on the type of literature review and the discipline.
What is in the literature review?A literature review is known to be a form of a detail summary of former research on a topic.
Note that the literature review is one that looks into scholarly articles, books, area of research and as such, the type of sources Lucy will use in her literature review will depend on the type of literature review and the discipline.
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If you forget to put a closing quotation mark on a string, what kind of error will be raised?
If you forget to put a closing quotation mark on a string, compilation (syntax) error is the kind of error that will be raised.
What is a closed quotation mark?The symbol is known to be one that is often used at the start of the quotation ("opening quotation mark") and it is one that is usually seen as “ ("open inverted commas") or ' ("open inverted comma").
Note that in regards to computer science, a syntax error is known to be a kind of an error that is often seen in the syntax of any given sequence of characters or what we call tokens that is said to be made or intended to be written in a specific programming language.
Therefore, If you forget to put a closing quotation mark on a string, compilation (syntax) error is the kind of error that will be raised.
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One of the many roles of the security compliance committee is to focus on controls that are widely used across a large population of applications, systems, and operations. These types of controls are known as ___________________.
A(n) ________ is a set of one or more computer programs that serves as an intermediary between the user and the DBMS.
Answer:
A database application is a set of one or more computer programs that serves as an intermediary between the user and the DBMS.
Explanation:
DBMS stands for Database Management Systems. Therefore, it would make sense that the database application is the set of computer programs that are the mediator between the user and the DBMS.
9.1% complete Question A government agency is getting rid of older workstations. The agency will donate these workstations, along with other excess computer systems, to nearby schools. Management reminds the systems administrators about data sanitization and security concerns. What actions secure the systems prior to donating to the schools?
The action that can secure the systems prior to donating to the schools is that they should use a data sanitization tool and also replace the hard drive with an empty one .
What is the aim of a data sanitization tool?The aim of data sanitization is for the full or total clearing of devices and getting rid of all sensitive data only if the storage device is not been used or is said to be transferred to another Information system .
Hence, The action that can secure the systems prior to donating to the schools is that they should use a data sanitization tool and also replace the hard drive with an empty one .
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Theorem: for any two real numbers, x and y, if x and y are both rational then x y is also rational. Which facts are assumed and which facts are proven in a proof by contrapositive of the theorem?
The facts that are assumed and the facts that are proven in a direct proof of the theorem is that option a) Assumed: x is rational and y is rational and Proven: x + y is rational.
What is a theorem?The term known as theorem is known to be a kind of a formula, or statement that is seen in a lot of mathematics field and it also known top be the logic deduced.
Note that it is also seen as the result that is said to have been proved to be true (through the use of operations and facts that are said to be already known).
Therefore, The facts that are assumed and the facts that are proven in a direct proof of the theorem is that option a) Assumed: x is rational and y is rational and Proven: x + y is rational.
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Theorem: For any two real numbers, x and y, if x and y are both rational then x + y is also rational. Which facts are assumed and which facts are proven in a direct proof of the theorem?
a) Assumed: x is rational and y is rational
Proven: x + y is rational
b) Assumed: x + y is irrational
Proven: x is irrational and y is irrational
c) Assumed: x + y is rational
Proven: x is rational or y is rational
d) Assumed: x is rational or y is rational
Proven: x + y is rational
All of the following formats may contain incorrect or misleading information. on which should you be most careful about trusting the information you come across as it may seem academically reviewed but in fact is not?
Wikis is the one on which should you be most careful about trusting the information you come across as it may seem academically reviewed but in fact is not.
What is Wikis?A wiki is known to be a form of a collaborative tool that is used and one that aids students to make their own contribution and change one or more pages of course linked materials.
Note that based on the above, Wikis is the one on which should you be most careful about trusting the information you come across as it may seem academically reviewed but in fact is not.
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Illuminate all lamps and leds, remove fuses, and verify that trouble signals occur when testing
Illuminate all lamps and leds, remove fuses, and verify that trouble signals occur when testing for voltage.
What tool can Technicians use to check the lighting and accessory circuits?The technician can use a Voltmeter, ohmmeter, or continuity test and this is one that can best be used to test the above circuits.
Hence, Illuminate all lamps and leds, remove fuses, and verify that trouble signals occur when testing for voltage.
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