A. 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.

B. Create an owner-based sharing rule to share records owned by a Customer Community role with all internal users.

C. Create a Sharing Set that includes a Customer Community profile and create a Share Group for the Sharing Set.

D. Create a Share Group for a Customer Community profile that is not associated with a Sharing Set.