You work as a network technician at Company. Please study the exhibit carefully. In this   Company wireless network， the LAP （lightweight access point） attempts to register to a WLC  （Wireless LAN Controller）.  What kind of message is transmitted？（）

• A、 The lightweight access point will send Layer 2 and Layer 3 Lightweight Access Point （LWAPP）  mode discovery request messages at the same time.
• B、 The lightweight access point will send Layer 3 Lightweight Access Point （LWAPP） mode  discovery request messages only.
• C、 The lightweight access point will send Layer 2 Lightweight Access Point （LWAPP） mode
• D、iscovery request messages. If the attempt fails， the LAP will try Layer 3 LWAPP WLC discovery.  D. The lightweight access point will send Layer 2 Lightweight Access Point （LWAPP） mode  discovery request messages only.