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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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