In a PIM Sparse Mode based multicast topology, what role does the Rendezvous Point provide?

In a PIM Sparse Mode based multicast topology, what role does the Rendezvous Point provide?
A . The node is used to provide (S,G) across a Layer 3 boundary.
B . The location PIM sends traffic before invoking SPT.
C . The node is used to provide (*,G) on a Layer 2 shared segment.
D . The first-hop router is used to provide routing between the source and receiver.

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Answer: B