Why are managed subnets configure in out-of-band virtual gateway mode?

A.
Configures the Cisco NAS to map the managed subnet to the proper access VLAN

B.
Configure the Cisco NAS with an IP Address in the untrusted VLAN that Cisco NAS can use to send ARP request in that particular VLAN

C.
Configure the Cisco NAM management subnet so that all the Cisco NAM initiated traffic will be sent out on the proper management subnet

D.
Configure the Cisco NAS management subnet so that all the Cisco NAS initiated traffic will sent out of the proper management subnet