Refer to the exhibit.

A customer has these availability requirements:
loss of one controller with stateful failover and without impact on wireless client connectivity

loss of one core switch without loss of connectivity for any endpoints or APs in the building

loss of any one switch-to-switch or MC-to-switch link without loss of connectivity for any endpoints or

APs in the building and with minimal impact on infrastructure functionality loss of any one access switch with minimal impact to wireless client connectivity

The exhibit shows the current plan for the topology.
Which change should the architect make to the plan to provide better support for the customer availability requirements?