多选题Which three statements about bidirectional PIM are true？（）ATraffic for a bidirectional group flows along the one shared tree and simultaneously utilizes multiple paths in a redundant network topologyBIt does not require any traffic signaling in the protocolCMembership to a bidirectional group is signaled using explicit Join messagesDIt maintains source-specific forwarding stateEIt reduces memory， bandwidth， and CPU requirements
多选题
Which three statements about bidirectional PIM are true？（）
A
Traffic for a bidirectional group flows along the one shared tree and simultaneously utilizes multiple paths in a redundant network topology
B
It does not require any traffic signaling in the protocol
C
Membership to a bidirectional group is signaled using explicit Join messages
D
It maintains source-specific forwarding state
E
It reduces memory， bandwidth， and CPU requirements
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