What are two QoS requirements for VoIP traffic?

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What are two QoS requirements for VoIP traffic?
A . Voice traffic must be marked "to DSCP EF.
B. Loss must be no more man 1 percent.
C. Voice traffic must be marked to DSCP AF41.
D. One-way latency must be no more than 200 ms.
E. Average one-way jitter is greater than 50 ms.

Answer: A,B