An engineer must reduce the amount of inter-controller roaming at a facility that has deployed N+1 high availability. Which strategy for performing this action is the best?

Placing all APs in the same mobility group enables seamless inter-controller roaming but does not reduce how often it occurs, since APs can still be anchored to different WLCs.

Interface groups manage DHCP pool assignment for WLANs and have no relationship to roaming decisions or which controller handles a client session.

When APs in a physical zone share a common primary WLC, clients roaming between those APs stay on the same controller and their roaming is handled locally without involving the mobility tunnel infrastructure. Intra-controller roaming is faster and less overhead-intensive than inter-controller roaming. This geographic alignment of APs to a primary WLC is the recommended strategy for minimizing inter-controller roaming events.

Client load balancing redistributes clients across APs to balance capacity, which can actively increase inter-controller roaming by directing clients toward APs on different WLCs.