A Customer Requires High Availability for Wireless Services, Including Stateful

A customer requires high availability for wireless services, including stateful failover for user connections if the Mobility Controller (MC) that handles the user traffic fails. What is the requirement for the design?

A) MCs are deployed in a cluster, and they are on the same VLAN.
B) MCs are distributed across each VLAN on which APs are deployed and have VRRP enabled.
C) MCs have a standby master IP address assigned to them.
D) MCs have enough licenses to support the APs for which they are active and standby MC.