What must be done to upgrade a Cisco NAC Appliance implementation to take advantage of a major release of NAC Appliance?

A.
Upgrade the Cisco NAM Servers. When the Cisco NAM servers come online, Cisco NAS upgrades will occur automatically

B.
First upgrade the Cisco NAS servers, bring the Cisco NAS online and then upgrade the Cisco NAM Servers

C.
First Upgrade the Cisco NAM Servers, Bring the Cisco NAM Serer online and then upgrade the Cisco NAS Servers.