Refer to the exhibit. Why does the trust state of interface FastEthernet 0/3 show “not trusted”?

A.
ToS has not been configured.

B.
ToS has been misconfigured.

C.
The commandmls qos needs to be turned on in global configuration mode.

D.
DSCP map needs to be configured for VOIP.

E.
There is not a Cisco Phone attached to the interface.