A developer identifies the following triggers on the Expense__c object: deteleExpense, applyDefaultsToExpense, validateExpenseUpdate; The triggers process before delete, before insert, and before update events respectively. Which two techniques should the developer implement to ensure trigger best practices are followed? (Choose two.)

A. Unify the before insert and before update triggers and use Process Builder for the delete action.
B. Create helper classes to execute the appropriate logic when a record is saved.
C. Maintain all three triggers on the Expense__c object, but move the Apex logic out of the trigger definition.
D. Unify all three triggers in a single trigger on the Expense__c object that includes all events.

Suggest answer: BD

Reference: