If CK has a Partner user at a child account that creates a case, who will have access?

Cloud Kicks (CK) has a Partner Community with an External Account hierarch. The Number of Partner Roles is set to two with the roles defined as Partner Manager and partner user.

If CK has a Partner user at a child account that creates a case, who will have access?
A . The Partner user who created the case those in the Partner Manager role above them, and those in the Partner manager role in the Partner account
B. The Partner user who created the case, their peers in the Partner user role, those in the Partner manager role above them, those in the Partner user role in the partner account, and those in the partner Manager role in the parent account.
C. The partner user who created the case, their peers in the partner user role, those in the partner Manager role above them, and those in the Partner Manager role in the parent account.
D. The partner User who created the case, those in the partner Manger role above them, those in the Partner user role in the parent account, and those in the partner manager role in the parent account.

Answer: B