Why Would We Not Include an End User's PC Device

Multiple Choice

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