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[单选] As an experienced network administrator, you are asked to troubleshoot a QoS problem. In which way might the Cisco NetFlow be helpful during the troubleshooting process?()

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

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