单选题Which of the following statements is correct regarding PIM Sparse Mode operations？（）AIt does not support all underlying unicast routing protocols like GBPBIt supports shared trees only assuming all hosts want the multicast trafficCReceivers are registered with RP by their first-hop routerDReceivers are joinedto the Shared Tree（rooted the rp ）by their local Designated Router（DR）EFrom the RP，traffic flows down a Source Tree to each receiver
单选题
Which of the following statements is correct regarding PIM Sparse Mode operations？（）
A
It does not support all underlying unicast routing protocols like GBP
B
It supports shared trees only assuming all hosts want the multicast traffic
C
Receivers are registered with RP by their first-hop router
D
Receivers are joinedto the Shared Tree（rooted the rp ）by their local Designated Router（DR）
E
From the RP，traffic flows down a Source Tree to each receiver
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