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Valid DEX-450 Test Question - Associate DEX-450 Level Exam

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q79-Q84):

NEW QUESTION # 79
Universal Containers wants to back up all of the data and attachments in its Salesforce org once a month.
Which approach should a developer use to meet this requirement?

A. Create a Schedulable Apex class.
B. Use the Data Loader command line.
C. Schedule a report.
D. Define a Data Export scheduled job.

Answer: D

NEW QUESTION # 80
As part of new feature development, a developer Is asked to build a responsive application capable of responding to touch events, that will be executed on stateful clients.
Which two technologies are built on a framework that fully supports the business requirement?
Choose 2 answers

A. Visualforce Pages
B. Aura Components
C. Lightning Web Components
D. Visualforce Components

Answer: B,C

Explanation:
To build a responsive application capable of responding to touch events and executed on stateful clients, the developer should use technologies that support modern web standards, responsive design, and touch interactions. The two technologies that meet these requirements are Aura Components and Lightning Web Components.
Option A: Aura Components
Reference:
"The Aura Components programming model is designed to support developing responsive applications for mobile and desktop devices."
- Lightning Aura Components Developer Guide
Option C: Lightning Web Components
"Lightning web components are custom HTML elements built using HTML and modern JavaScript."
"Because Lightning web components are based on web standards, they are inherently efficient and deliver exceptional performance."
- Lightning Web Components Developer Guide
Why Other Options Are Incorrect:
Option B: Visualforce Pages
Visualforce is a server-side framework that doesn't fully support responsive design or touch events natively. While you can make Visualforce pages responsive using custom code, it doesn't provide built-in support for touch events as effectively as Aura Components or LWC.
"Visualforce is a component-based user interface framework for the Force.com platform."
- Visualforce Developer Guide
Option D: Visualforce Components
Visualforce Components are custom components within the Visualforce framework. They inherit the same limitations as Visualforce Pages regarding responsiveness and touch support.
"A Visualforce component is either a standard component, provided by the Visualforce framework, or a custom component that you create."
- Visualforce Developer Guide

NEW QUESTION # 81
A developer created an Apex trigger using the Developer Console and now wants to debug codeHow can the developer accomplish this in the Developer Console?

A. Open the logs tab in the Developer Console.
B. Add the user name in the Log Inspector.
C. Select the Override Log Triggers checkbox for the trigger
D. Open the Progress tab in the Developer Console.

Answer: A

NEW QUESTION # 82
A developer writes a trigger on the Account object on the before update event that increments a count field. A workflow rule also increments the count field every time that an Account is created or update. The field update in the workflow rule is configured to not re-evaluate workflow rules. What is the value of the count field if an Account is inserted with an initial value of zero, assuming no other automation logic is implemented on the Account?

A. 0
B. 1
C. 2
D. 3

Answer: A

NEW QUESTION # 83
A developer needs to prevent the creation of request records when certain conditions exist in the system. A RequestLogic class exists to checks the conditions. What is the correct implementation?

A. Trigger RequestTrigger on Request (before insert) {
RequestLogic.validateRecords {trigger.new};
}
B. Trigger RequestTrigger on Request (after insert) {
RequestLogic.validateRecords {trigger.new};
}
C. Trigger RequestTrigger on Request (after insert) {
if (RequestLogic.isValid{Request})
Request.addError {'Your request cannot be created at this time.'};
}
D. Trigger RequestTrigger on Request (before insert) {
if (RequestLogic.isvalid{Request})
Request.addError {'Your request cannot be created at this time.'};
}

Answer: A

NEW QUESTION # 84
......

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