What is a description of the DiffServ model used for implementing QoS?

What is a description of the DiffServ model used for implementing QoS?
A . AF41 has higher drop precedence than AF42. which has higher drop precedence than AF43.
B . Voice and video calls are marked with different DSCP values and placed in different queues.
C . AF43 has higher drop precedence than AF42 but lower drop precedence than AF41.
D . RTP traffic from voice and video calls is marked EF and placed in the same queue.

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Answer: A