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?

Which standard field needs to be populated when a developer inserts new Contact records programmatically?

A developer needs to provide a way to mass edit,update, and delete records from a list view in which two ways can this be accomlpished? choose 2 answers

When creating a record with a Quick Action, what is the easiest way to post a feed item?

A developer has the following code block:
public class PaymentTax {public static decimal SalesTax = 0.0875;} trigger OpportunityLineItemTrigger on OpportunityLineItem (before insert, before update) {PaymentTax PayTax = new PaymentTax();decimal ProductTax = ProductCost * XXXXXXXXXXX;} To calculate the productTax, which code segment would a developer insert at the XXXXXXXXXXX to make the value the class variable SalesTax accessible within the trigger?