With the BGP peerings shown, which 3 solutions are most correct? (Exhibit)

A.
rtrA and rtrD are route-reflector-clients; rtrB and rtrC are route reflectors part of the same cluster.

B.
rtrA and rtrD are route-reflector-clients; rtrB and rtrC are route reflectors part of the different cluster.

C.
rtrA, rtrB and rtrC are part of a confederation sub-AS and rtrD is part of a different confederation sub-AS

D.
rtrA, rtrB are part of one confederation sub-AS and rtrC,rtrD are part of a different confederation sub-AS

E.
rtrA, rtrB and rtrC are part of a confederation sub-AS where rtrB is a route reflector and rtrA, rtrC are route-reflector-clients.