Refer to the exhibit.

A customer needs a wireless network upgrade and has these requirements.
- Support any applications used on a wired connection
- Support up to 2500 wireless clients
- Support seamless roaming from floor to floor and building to building
- Continue to function seamlessly if one controller fails
The architect has designed the logical infrastructure for the network as shown in the exhibit Which change should the architect make to belter meet customer requirements and besl practices?