Which statement about multicast RPs is true?

Which statement about multicast RPs is true?
A . RPs are required only when using protocol independent multicast dense mode.
B . RPs are required for protocol independent multicast sparse mode and dense mode.
C . By default, the RP is needed periodically to maintain sessions with sources and receivers
D . By default, the RP is needed only to start new sessions with sources and receivers.

Answer: D

Explanation:

A rendezvous point (RP) is required only in networks running Protocol Independent Multicast sparse mode (PIM-SM).

By default, the RP is needed only to start new sessions with sources and receivers.