Which two statements about policing, queuing, and scheduling are true? (Choose two.)

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Which two statements about policing, queuing, and scheduling are true? (Choose two.)

A. The WRED algorithm is a reactive approach that only applies to traffic congestion.
B. Policing is the monitoring of data rates for a particular class of traffic. The device can also monitor associated burst sizes.
C. You can schedule traffic by imposing a maximum data rate on a class of traffic so that excess packets are dropped from the queue.
D. Only single rate and dual rate policies can be defined.
E. You can apply WRED to a class of traffic, which allows packets to be dropped based on the CoS field.