When QoS levels in the Cisco Wireless Control System （WCS） are entered， which profile names are used to identify the access categories？（）

• A、 platinum， gold， silver， and bronze
• B、 voice， gold， silver， and bronze
• C、 low delay， network critical， business， best effort
• D、 voice， video， background gold， background silver， and best effort
• E、 voice， video， best effort， and background
• F、 voice， video， best effort， background， and scavenger