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单选题
What is the purpose of the WLC Controller->Multicast->IGMP Timeout feature operating on v5.2?()
A

to determine if there are more clients that are using the multicast stream

B

to limit the time that a client has to request an IGMP join to the controller multicast group

C

to determine if the multicast router is still alive and responding to multicast clients

D

to remove clients from the multicast group if the multicast traffic exceeds the allotted bandwidth allowed  for multicast clients


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