Which COS to DSCP map must be modified to ensure that voice traffic is treated properly?

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During deployment, a network engineer notices that voice traffic is not being tagged correctly as it traverses the network.

Which COS to DSCP map must be modified to ensure that voice traffic is treated properly?
A . COS of 5 to DSCP 46
B . COS of 7 to DSCP 48
C . COS of 6 to DSCP 46
D . COS of 3 to DSCP of 26

Answer: A