How can you extend an app with custom logic using in-app extensions? Note: There are 2 correct answers to this question.

How can you extend an app with custom logic using in-app extensions? Note: There are 2 correct answers to this question.
A . Implement custom logic at predesignated SAP enhancement points.
B. Ascertain that the app is extensible.
C. Apply modifications to the copy of the original app.
D. Assign new roles and catalogs to the extended app.

Answer: A,B