Exhibit： You work as a network technician. Please study the exhibit carefully. In this wireless network， theLAP （lightweight access point） attempts to register to a WLC （Wireless LAN Controller）. What kindof 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） modediscovery request messages only
• C、The lightweight access point will send Layer 2 Lightweight Access Point （LWAPP） mode discovery 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） modediscovery request messages only