Which three WLAN statements are true？ （Choose three.） （） 

• A、 A lightweight AP receives control and configuration from a WLAN controller to which it is associated.
• B、 A WLAN client that is operating in half-duplex mode will delay all clients in that WLAN
• C、 A dhoc mode allows mobile clients to connect directly without an intermediate AP
• D、 Another term for infrastructure mode is independent service set （IBSS）
• E、 The Aironet 1230 access point is an example of an access point that operates solely as a lightweight  access point.
• F、 WLANs are designed to share the medium and can easily handle an increased demand of channel  contention.