What must a business user do to create a credit memo?

A credit memo request was created for a customer.

What must a business user do to create a credit memo? Note: There are 2 correct answers to this question.
A . Reject the credit memo request item.
B . Create it with reference to a credit memo request.
C . Create it with reference to an order.
D . Ensure the billing block is removed.

Answer: B,D