How can a developer use a Set<Id> to limit the number of records returned by a SOQL query?

A developer has a single custom controller class that works with a Visualforce Wizard to support creating and editing multiple sObjects. The wizard accepts data from user inputs across multiple Visualforce pages and from a parameter on the initial URL.
Which three statements are useful inside the unit test to effectively test the custom controller? (Choose three.)

What is a capability of a StandardSetController?Choose 2 answers

What can used to delete components from production?

A visualforce interface is created for Case Management that includes both standard and custom functionality defined in an Apex class called myControllerExtension. The visualforce page should include which
<apex:page> attribute(s) to correctly implement controller functionality?