When configuring a large, high-availability wireless network, which change to a mobility group creates less...

Removing unnecessary controllers from the mobility group (B) would create less load on the controllers while maintaining the same mobility messages. This is because each controller in a mobility group shares its client database with other controllers, which can lead to increased overhead. By minimizing the number of controllers in the group, the load is reduced. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide.