Refer to the exhibit.

Using the object model in the diagram, a user needs to have a new attribute available only in
custom_document_b, custom_document_c, and custom_document_d.
To which object(s) should the new attribute be added?

A.
dm_document

B.
custom_document_b only

C.
custom_document_c and custom_document d only

D.
custom_document_b, custom_document_c and custom_document d

Explanation: