When configuring an MEP VPN facility, you would specify a backup gateway in the VPN screen of
the gateway properties window. What could be the reason for the backup gateway not being
available in the drop down list?

A.
The backup gateway is already a backup to another gateway

B.
The backup gateway is not running VPN-1

C.
The backup gateway is not defined as an internal object on this gateway

D.
The backup gateway is not defined as an external object on this gateway