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

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Answer: D