Which two statements correctly describe a Cisco WLC configuration of Wireless > QoS > Profiles >Wired_QoS_Profiles for an implementation of DSCP or CoS deployment?（）

A. It must always be set on all QoS profile types because this sets the type of markings as either CoS or DSC
B. It is optional if the Cisco WLC attached switch operates on a trust DSCP model.
C. It must be set if the Cisco WLC attached switch operates on a trust CoS model.
D. It sets the EDCF queue used for the radio-transmitted frames.