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In PIM-SM what control plane signaling must a multicast source perform before it begins to send multicasttraffic to a group?()
A.
The source must send a PIM Register message to the rendezvous point (RP).
B.
The source must first join the multicast group using IGMP before sending.
C.
The source must perform a Request to Send (RTS) and Clear to Send (CTS) handshake with the PIM designated router (DR).
D.
No control plane signaling needs to be performed; the source can simply begin sending on the local subnet.