Which declarative method helps ensure quality data? (Choose 3)

Which two automation tools include a graphical designer? Choose 2 answers

Given the code below:

What should a developer do to correct the code so that there is no chance of hitting a governor limit?

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?

A lead object has a custom field Prior_Email__c. The following trigger is intended to copy the current Email into the Prior_Email__c field any time the Email field is changed:

Which type of exception will this trigger cause?