Addressing QoS design in the Enterprise Campus network for IP Telephony applications means what?

Addressing QoS design in the Enterprise Campus network for IP Telephony applications means what?
A . It is critical to identify aggregation and rate transition points in the network, where preferred traffic and congestion QoS policies should be enforced
B . Suspect traffic should be dropped closest to the source, to minimize wasting network resources
C . An Edge traffic classification scheme should be mapped to the downstream queue configuration
D . Applications and Traffic flows should be classified, marked and policed within the Enterprise Edge of the Enterprise Campus network

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Answer: A