Which two of these statements about hierarchical route reflectors are correct? (Choose two.)

A.
A route reflector can be a client of another route reflector.

B.
Each cluster within the hierarchy can only contain one route reflector.

C.
The hierarchy can be as deep as needed.

D.
A route reflector can have clients in different clusters.

E.
Hierarchical route reflectors are set up using three levels (access, distribution, and core layers).