问题：

[多选] 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.