Which Cisco NAC appliance out-of-band solution statement is correct?

Which Cisco NAC appliance out-of-band solution statement is correct?

A.
Access switch to Cisco NAM configuration and status change messages are communicated via a proprietary protocol

B.
The Swichport Access and authentication VLAN information is sent to the access switch from the Cisco NAM

C.
As a laptop device accesses the Cisco NAC Appliance network, the access switch sends the device MAC address to the Cisco NAS

D.
All client traffic flows through the CAS while access switch VLAN management is performed out of band