How can records owned by Customer Community users be shared with internal users?

How can records owned by Customer Community users be shared with internal users?
A . Create a Sharing Set that includes a Customer Community profile and create a Share Group for the Sharing Set.
B . Create an owner-based sharing rule to share records owned by a Customer Community role with all internal users.
C . Create a Share Group for a Customer Community profile that is not associated with a Sharing Set.
D . Use the standard is Owned By External User checkbox on records to create a criteria-based sharing rule to share records owned by Customer Community users with all internal users.

Answer: C