Which three statements are true about class-of-service (CoS) schedulers?

Which three statements are true about class-of-service (CoS) schedulers? (Choose three )
A. Schedulers determine into which queue a packet should be assigned.
B. Schedulers determine the packet transmission rate for each queue.
C. Schedulers determine the packet markings that are used to prioritize traffic.
D. Schedulers determine how packets are handled during times of congestion.
E. Schedulers determine the size of buffer assigned to each queues.

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