How can Cisco NetFlow be used to aid in the operation and troubleshooting of QoS issues? （）

• A、NetFlow can report on the number of traffic matches for each class map in a configured QoS policy configuration.
• B、NetFlow records can be used to understand traffic profiles per class of service for data, voice, and video traffic.
• C、NetFlow can discover the protocols in use and automatically adjust QoS traffic classes to meet policy-map requirements.
• D、NetFlow can be configured to identify voice and video traffic flows and place them into a lowlatency queue for expedited processing.