An engineer configures the wireless LAN controller to perform 802.1x user authentication. Which configuration must be enabled to ensure that client devices can ...

An engineer configures the wireless LAN controller to perform 802.1x user authentication.
Which configuration must be enabled to ensure that client devices can connect to the wireless, even when WLC cannot communicate with the RADIUS?

A. pre-authentication B. local EAP C. authentication caching D. Cisco Centralized Key Management