You want to add a custom attribute to an out-of-the-box (OOTB) struct called CaseDetails. You create a custom struct called CustomCaseDetails. Both structs are shown in the diagram.

Which association should you model next?

A. CustomCaseDetails subclasses CaseDetails.
B. CustomCaseDetails aggregates CaseDetails.

C. CaseDetails is assigned to CustomCaseDetails.

D. CaseDetails aggregates CustomCaseDetails.