单项选择题

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.