Which security option should be configured?

An engineer requires authentication for WPA2 that will use fast rekeying to enable clients to roam from one access point to another without going through the
controller. Which security option should be configured?

A.
PSK

B.
AES

C.
Cisco Centralized Key Management

D.
802.1x

Explanation:
Cisco Centralized Key Management (CCKM) is the first fast-secure roaming method developed and implemented on enterprise WLANs, created by
Cisco as the solution used in order to mitigate the delays explained thus far, when 802.1X/EAP security is used on the WLAN. As this is a Cisco proprietary
protocol, it is only supported by Cisco WLAN infrastructure devices and wireless clients (from multiple vendors) that are Cisco Compatible Extension (CCX)-
compatible for CCKM.
CCKM can be implemented with all of the different encryption methods available for WLANs, to include: WEP, TKIP, and AES. It is also supported with most of the

802.1X/EAP authentication methods used for WLANs, dependent upon the CCX version supported by the devices.
http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/116493-technote-technology-00.html#anc8