What does the redundant interface feature of the security appliance accomplish?

A.
to allow a VPN client to send IPsec-protected traffic to another VPN user by allowing such
traffic in and out of the same interface

B.
to increase the number of interfaces available to your network without requiring you to add
additional physical interfaces or security appliances

C.
to increase the reliability of your security appliance

D.
to facilitate out-of-band management