When a WLAN controller sends an 802.11 frame to a lightweight AP for transmission on the wireless medium, how does it mark the frame for 802.11 QoS priority?

A.
The WLAN controller will place the user priority (UP) value in the QoS Control field of the 802.11 frame header before passing it to the lightweight AP.

B.
The WLAN controller does not mark 802.11 frames with priority values only the APs can do this.

C.
The WLAN controller does not mark the 802.11 frames with priority values only the Layer 3 switches can do this.

D.
The WLAN controller does not mark the 802.11 frames with priority values only the Layer 3 routers can do this.