By default, what value is voice traffic marked as on a Cisco Catalyst Switch?

By default, what value is voice traffic marked as on a Cisco Catalyst Switch?
A . DSCP CAS6 value 21, Cos 3
B . DSCP AF21 value 46, Cos 5
C . DSCP EF value 46, Cos 7
D . DSCP EF value 46, Cos 5

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Answer: D