Which statement about PIM sparse mode operations is true?

A.
It does not support all underlying unicast routing protocols like BGP

B.
Receivers are registered with RP by their first hop router

C.
From the RP, traffic flows down a source tree to each receiver.

D.
It supports shared trees only, and assumes all hosts want the multicast traffic

E.
Receivers are joined to the shared tree by their local designated router