Which type of exception will this trigger cause?

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?
A. A null reference exception
B. A compile time exception
C. A DML exception
D. A limit exception when doing a bulk update

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2 thoughts on “Which type of exception will this trigger cause?

  1. There is typo in second last line ‘trigger.old,ap’. If this is deliberately done then it will have compile time exception

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