Which condition must be true to allow an access port to trust QoS markings on an incoming frame?

Which condition must be true to allow an access port to trust QoS markings on an incoming frame?
A . The switch must be configured globally with the mls qos trust cos command.
B . The port must be configured with the mls qos cos command.
C . The port must be configured with the mls qos trust dscp command.
D . The switch must be configured globally with the vlan dot1q tag native command.

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Answer: C