In which direction does Application Visibility and Control mark the DSCP value of the original packet in the wireless LAN controller?

In which direction does Application Visibility and Control mark the DSCP value of the original packet in the wireless LAN controller?
A . Marking can be specified bidirectionally or, with respect to direction, that is, upstream or downstream.
B . Marking can be specified in one direction, upstream only.
C . Marking can be specified bidirectional only.
D . Marking can only be specified with respect to direction, that is, upstream or downstream.

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Answer: A