The correct answer is A, 192.0.2.1. According to RFC 5737, the virtual IP address used in the configuration of Local WebAuth on a Cisco Wireless LAN Controller should be from the block of addresses reserved for documentation and example code, which includes the 192.0.2.0/24 range. This ensures that there is no conflict with real IP addresses in use on the network. References: This is supported by the Cisco documentation on configuring virtual interfaces, which recommends using a non-routable IP address from the RFC5737 ranges for the virtual interface to avoid conflicts with network infrastructure addresses2.