Why would we not include an end user’s PC device in a QoS trust boundary?

Why would we not include an end user’s PC device in a QoS trust boundary?
A . The end user could incorrectly tag their traffic to bypass firewalls.
B . There is no reason not to include an end user’s PC device m a QoS trust boundary
C . The end user may incorrectly tag their traffic to be prioritized over other network traffic
D . The end user could incorrectly tag their traffic to advertise their PC as a default gateway.

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Answer: C