An engineer needs to address roaming issues with sticky clients in high-density areas on a campus. Which feature must the engineer configure?

Layer 3 roaming describes how a client retains its IP address when roaming between controllers in different subnets and does not address the problem of a client refusing to roam at all.

Load balancing spreads clients evenly across APs at association time, and band select encourages 5 GHz use, but neither feature forces a poorly connected client to roam away from its current AP.

Optimized roaming monitors each client's RSSI and data rate and disconnects clients that fall below the configured minimum thresholds, directly solving the sticky client problem in high-density environments. Unlike passive features, it proactively triggers the roam by deauthenticating the client, which forces the device to rediscover and connect to a stronger AP. This is the purpose-built Cisco feature for addressing sticky client behavior.

Layer 2 roaming describes intra-controller or same-subnet inter-controller roaming mechanics and does not provide any mechanism to force a sticky client to move to a better AP.