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