what happens if the source starts sending multicast traffic toward R1 and there are receivers registered at the RP?

Click the Exhibit button.

In the exhibit, what happens if the source starts sending multicast traffic toward R1 and there are receivers registered at the RP?

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

B.
R1 encapsulates the multicast packets into PIM join unicast messages.

C.
R1 forwards the multicast packets on the S,G tree towards the RP.

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