单项选择题

Which statement about the Lightweight Access Point Protocol （LWAPP） is true？（）

A. LWAPP encrypts control traffic between the AP and the controller.
B. LWAPP encrypts user traffic with a x.509 certificate using AES-CCMP
C. LWAPP encrypts both control traffic and user data.
D. When set to Layer 3， LWAPP uses a proprietary protocol to communicate with the Cisco Aironet APs.

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Which statement is true about IP telephony calls？（）

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