You Want to Establish Redundant VPN Connections and Customer Gateways

You want to establish redundant VPN connections and customer gateways on your network by setting up a second VPN connection. Which of the following will ensure that this functions correctly?

A) The customer gateway IP address for the second VPN connection must be publicly accessible.
B) The virtual gateway IP address for the second VPN connection must be publicly accessible.
C) The customer gateway IP address for the second VPN connection must use dynamic routes.
D) The customer gateway IP address for the second VPN connection must be privately accessible and be the same public IP address that you are using for the first VPN connection.