How can UC give support representatives access to Container and Case records owned by Customer Community users?

Universal containers (UC) implemented a private organization-wide default for the Container and Case objects.

How can UC give support representatives access to Container and Case records owned by Customer Community users?
A . Create an ownership-based sharing rule that gives access to the head of support role and internal subordinates
B. Create a criteria-based sharing rule that gives access to the head of support role and internal subordinates
C. Support representatives nil automatically get access to these records via the role hierarchy
D. Create a Share Group based on the sharing set created for the Customer Community User Profile.

Answer: D