Given a list of Opportunity records named opportunityList, which code snippet is best for querying all Contacts of the Opportunity's Account?
List <Contact> contactList = new List <Contact>();

• A.for ( Contact c : [SELECT Id FROM Contact WHERE AccountId IN
  :opportunityList.AccountId] ){
  contactList.add(c);
  }
• B.Set <Id> accountIds = new Set <Id> ();
  for (Opportunity o : opportunityList){
  contactIds.add(o.ContactId);
  }
  for(Contact c : [SELECT Id FROM Contact WHERE Id IN :contactIds]){
  contactList.add(c);
  }
  List <Contact> contactList = new List <Contact>();
• C.Set <Id> accountIds = new Set <Id> ();
  for(Opportunity o : opportunityList){
  accountIds.add(o.AccountId);
  }
  for(Account a : [SELECT Id, (SELECT Id FROM Contacts) FROM Account WHERE Id IN
  :accountIds]){
  contactList.addAll(a.Contacts);
  }
  List <Contact> contactList = new List <Contact>();
• D.for(Opportunity o : opportunityList){
  Account a = [SELECT Id, (SELECT Id FROM Contacts) FROM Account WHERE Id
  :o.AccountId]
  contactList.addAll(a.Contacts);
  )
  List <Contact> contactList = new List <Contact>();

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A developer has refactored an application and renamed an Apex class in a sandbox and now needs to deploy the changes to production. How can this be accomplished? Choose 2 answers

• A.Use a changeset to both delete the old Apex class and deploy the new Apex class to production.
• B.Deploy the new Apex class with the Force.com Migration Tool and set the old name in destructiveChanges.xml.
• C.Use the Force.com IDE to delete the old Apex class from the project and deploy the changes to production.
• D.Deploy the new Apex class, and then log in to the production environment and manually delete the class.

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An Apex trigger creates an Order__c record every time an Opportunity is won by a Sales Rep. Recently the trigger is creating two orders. What is the optimal method for a developer to troubleshoot this?

• A.Run the Apex Test Classes for the Apex trigger to ensure the code still has sufficient code coverage.
• B.Turn off all Workflow Rules, then turn them on one at at time to see which one causes the error.
• C.Set up debug logging for every Sales Rep, then monitor the logs for errors and exceptions.
• D.add system.debug() statements to the code and use the Developer Console logs to trace the code.

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A developer created and tested a Visualforce page in their developer sandbox, but now receives reports that users are encountering ViewState errors when using it in Production. What should the developer ensure to correct these errors?

• A.Ensure properties are marked as private.
• B.Ensure queries do not exceed governor limits.
• C.Ensure properties are marked as Transient.
• D.Ensure profiles have access to the Visualforce page.

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A Visualforce page contains an industry select list and displays a table of Accounts that have a matching value in their Industry field.
<apex:selectList value="{!selectedIndustry}">
<apex:selectOptions values="{!industries}"/>
</apex:selectList>
When a user changes the value in the industry select list, the table of Accounts should be automatically updated to show the Accounts associated with the selected industry.
What is the optimal way to implement this?

• A.Add an <apex:actionSupport>within the <apex:selectOptions>.
• B.Add an <apex:actionFunction>within the <apex:selectList>.
• C.Add an <apex:actionFunction>within the <apex:selectOptions>.
• D.Add an <apex:actionSupport>within the <apex:selectList>.

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