问题：

[单选]

The LWAPP （Lightweight Access Point Protocol） is in use within the Company wireless LAN.
 Which statement is true about this protocol？（）

A .  Real-time frame exchange is accomplished within the access point.
B .  The control traffic between the client and the access point is encapsulated with the LWAPP. 
C .  Authentication， security， and mobility are handled by the access point.
D .  Data traffic between the client and the access point is encapsulated with LWAPP.
E .  None of the other alternatives apply