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 DSCP.
• 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.