Which DHCP option, when required, must be configured to help access points (APs) locate their...

DHCP Option 43 is a vendor-specific option used by lightweight access points to locate their Wireless LAN Controller (WLC) when no static discovery method (like DNS or manual config) is provided. During the DHCP request process, the AP receives Option 43 information that includes the WLC’s IP address. This is a standard method in controller-based WLAN deployments and is explicitly called out in the CWDP-305 Study Guide.