单选题In PIM-SM what control plane signaling must a multicast source perform before it begins to send multicasttraffic to a group？（）AThe source must send a PIM Register message to the rendezvous point （RP）.BThe source must first join the multicast group using IGMP before sending.CThe source must perform a Request to Send （RTS） and Clear to Send （CTS） handshake with the PIM designated router （DR）.DNo control plane signaling needs to be performed； the source can simply begin sending on the local subnet.
单选题
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.
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