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单项选择题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.

  • D

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