Answer : A > In PFC QoS, trust means to accept as valid and use as the basis of the initial internal DSCP value. Ports are untrusted by default, which sets the initial internal DSCP value to zero. You can configure ports to trust received CoS, IP precedence, or DSCP.
Reference : https://www.cisco.com/en/US/docs/general/Test/dwerblo/broken_guide/qos.html
It's A
In the context of Quality of Service (QoS) and trust boundaries, an "untrusted" interface typically does not trust the markings (like DSCP or CoS values) on incoming packets.
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