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 developer writes a trigger on the Account object on the before update event that increments a count field. A workflow rule also increments the count field every time that an Account is created or update.
The field update in the workflow rule is configured to not re-evaluate workflow rules. What is the value of the count field if an Account is inserted with an initial value of zero, assuming no other automation logic is implemented on the Account?

A developer needs to update an unrelated object when a record gets saved.
Which two trigger types should the developer create? (Choose two.)

A developer must create a CreditCardPaymentclass that provides an implementation of an existing Paymentclass.

Which is the correct implementation?

Which three data types can be returned from an SOQL statement? (Choose three.)