Which of the following is a true statement? Select all that apply.

Which of the following is a true statement? Select all that apply.
A . An access key is required to enhance an SAP application using a user exit.
B . An access key is required to implement an implicit enhancement point.
C . An access key is required to modify SAP repository objects.
D . An access key is required to implement business add-ins.

Answer: A,C