Refer to the exhibit.

There are receivers that are registered at the RP. If the source begins sending multicast traffic
toward R1, how will R1 handle that traffic?

A.
R1 forwards the multicast packets on the (S, G) tree toward the RP.

B.
R1 encapsulates the multicast packets into a PIM register multicast packet.

C.
R1 encapsulates the multicast packets into a PIM join unicast packet.

D.
R1 tunnels the multicast packets in PIM register messages toward the RP.