What must be true about the client before upstream traffic stream metrics can be displayed on the Cisco WLC?（）

• A、must be Cisco Compatible Extensions version 2
• B、must be Cisco Compatible Extensions version 3
• C、must be Cisco Compatible Extensions version 4
• D、must be associated to a Platinum QoS WLAN
• E、must be associated to an access point on a Cisco WLC with code version 5.0 or newer