An engineer is troubleshooting a DHCP configuration that is being used to discover two WLCs with the IP addresses of 192.168.10.10 and 192.168.10.11. Which string is used for configuration?

Option 80 is not typically used for WLC discovery; Option 43 is the standard for vendor-specific information required by Cisco APs for WLC discovery.

Option 60 is for vendor class identifier and does not directly provide WLC IP addresses; also, 'ip' is not the correct format keyword for specifying multiple WLCs within Option 43.

While Option 43 is correct, the format keyword 'ip' is incorrect for this specific configuration; the correct keyword to input hexadecimal vendor-specific information is 'hex'.

DHCP Option 43 is used for vendor-specific information to enable lightweight access points to discover Wireless LAN Controllers (WLCs). The 'hex' keyword specifies the input format, and the string 'f108' defines the Cisco vendor-specific type ('f1') and the total length ('08' for 8 bytes, representing two IP addresses). The subsequent hexadecimal values (e.g., 'c0a8.0a0A' for 192.168.10.10) are the representations of the WLC IP addresses.