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

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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Answer: A,B,D