What are AddOns specifically designed to allow an SAP Commerce developer to do? Note: There are 2 correct answer to this question.

What are AddOns specifically designed to allow an SAP Commerce developer to do? Note: There are 2 correct answer to this question.
A . Extend the Accelerator storefront.
B. Extend the Backoffice.
C. Provide additional RESTful web services for OCC.
D. Provide a new web application.

Answer: A,D