Which two statements regarding route reflectors are true? (Choose two)

A.
A non-route reflector capable router cannot be a client.

B.
A hierarchical route reflector design is where a route reflector client is not directly connected to the route reflector.

C.
If a client has IBGP sessions to other clients in the same cluster, those clients will receive unnecessary duplicated BGP updates.

D.
If a client in one cluster has an IBGP session to a route reflector that belongs to different clusters, the clients in the other cluster will receive unnecessary duplicated BGP updates.