A custom Visualforce controller calls the ApexPages.addMessage() method, but no messages are rendering on the page.

Which component should be added to the Visualforce page to display the message?

A.

B.

C.

D.

What is the optimal technique a developer should use to programmatically retrieve Global Picklist options in a Test Method?

A. Perform a callout to the Metadata API.

B. Use the Schema namespace.

C. Perform a SOQL Query.

D. Use a static resource.

A developer is writing unit tests for the following method:

public static Boolean isFreezing(String celsiusTemp){ if(String.isNotBlank(celsiusTemp) andand celsiusTemp.isNumeric()){ return Decimal.valueof(celsiusTemp) <= 0; } return null; }

Which assertion would be used in a negative test case?

A. System.assertEquals(true, isFreezing(null))

B. System.assertEquals (true, isFreezing('O')

C. System.assertEquals(null, isFreezing('asdf))

D. System.assertEquals(true, isFreezingClOO'))

How should a developer assert that a trigger with an asynchronous process has successfully run?

A. Create at test data in the test class, use System.runAs() to invoke the trigger, then perform assertions.

B. Insert records into Salesforce, use seeAllData-true, then perform assertions.

C. Create all test data, use @future In the test class, then perform assertions.

D. Create all test data in the test class, invoke Test.startTest() and Test.stopTest() and then perform assertions,

An org has a custom object, Part__c. Its records are regularly imported from the company's Enterprise Resource Planning (ERP) system. What can be used to ensure the correct Part__c records are updated in Salesforce when imports are made?

A. A Formula field

B. An External ID field

C. A Master-detail field

D. A Lookup field