An engineer must ensure that clients on an 802.1x WLAN can roam as fast as possible at a remote site that was deployed with FlexConnect. Which configuration ensures that this roaming occurs?

A FlexConnect group enables Opportunistic Key Caching (OKC) among all member APs at the same remote site, allowing them to share Pairwise Master Key (PMK) security associations. When a client roams to another AP in the same FlexConnect group, it re-uses the cached PMK instead of running a full 802.1x EAP exchange, dramatically reducing roaming latency even when the WLC link is unavailable.

FlexConnect ACLs filter locally switched traffic and have no effect on 802.1x re-authentication speed during a roaming event.

The 'learn client IP address' option allows the AP to detect a roaming client's existing IP for local switching continuity, but it does not reduce 802.1x re-authentication overhead.

AAA override enables RADIUS-returned attributes to supersede WLAN settings but does not accelerate the 802.1x key exchange process during roaming.