单选题How is RPF used in multicast routing？（）Ato prevent multicast packets from loopingBto prevent PIM packets from loopingCto instruct PIM where to send a （*， G） or （S， G） join messageDto prevent multicast packets from looping and to instruct PIM where to send a （*， G） or （S， G） joinmessage
单选题
How is RPF used in multicast routing？（）
A
to prevent multicast packets from looping
B
to prevent PIM packets from looping
C
to instruct PIM where to send a （*， G） or （S， G） join message
D
to prevent multicast packets from looping and to instruct PIM where to send a （*， G） or （S， G） joinmessage
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