In a PIM Sparse Mode (PIM-SM) based multicast topology, what function does the Rendezvous Point provide?

In a PIM Sparse Mode (PIM-SM) based multicast topology, what function does the Rendezvous Point provide?
A . The node is used to provide IGMP snooping across a layer 3 boundary.
B . The root node of the source tree topology is used to provide routing between the source and receiver.
C . The root node of the shared tree topology is used to provide routing between the source and receiver.
D . The node is used to provide IGMP snooping on a layer 2 shared segment.

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Answer: C