Which statement is true about the data traffic between the access point named TKAP1 and  controller TKC1？（）

• A、 The data traffic between the access point and controller is not encrypted.
• B、 The data traffic is encapsulated with LWAPP.
• C、 The data traffic is switched at the access point before being sent to the WLAN controller where  VLAN tagging and QoS are applied.
• D、 The data traffic is encrypted with AES.
• E、 All of the above