Which three statements about BGP confederation and route reflectors are true? (Choose three)

A.
Clusters are used in confederation schemes to avoid loops.

B.
BGP network can have a confederation within a route reflector area.

C.
An internal BGP network cannot have a route reflector within a confederation.

D.
An internal BGP network can have a route reflector within a confederation.

E.
Clusters are used in route reflector schemes to avoid loops.

F.
BGP network cannot have a confederation within a route reflector area.