A.Controllers

B.Renderer

C.helper

D.Style

E.Design

A.Implement the upsert DML statement.

B.Remove null items from the list if Accounts.

C.Implement Change Data Capture

D.Implement a try/catch block for the DML.

A.<apex:outputText value="{!$CurrentPage.parameters.userInput}" />

B.<apex:outputText escape="false" value=" {!$CurrentPage.parameters.userInput}" />

C.<apex:outputField value="{!ctrl.userInput}" />

D.<apex:outputField escape="false" value="{!ctrl.userInput}" />

A.A for loop, with a switch statement inside

B.A Switch statement, with a for loop inside

C.An If/else statement, with a for loop inside

D.A for loop, with an if/else statement inside

A.An ant migration tool deployment with a destructivechanges XML file and an empty package .xml file

B.A change set deployment with a destructivechanges XML file

C.A change set deployment with the delete option checked

D.An ant migration tool deployment with destructivechanges xml file and the components to delete in the package .xml file