A corporate environment includes Exchange Server 2010 SP1. The Exchange Server environment includes two Client Access servers, two Hub Transport servers, and two Mailbox servers on the internal network, and two Edge Transport servers in a perimeter network. An edge subscription is in place between the Hub Transport servers and the Edge Transport servers. When an Edge Transport server fails, messages accepted by that server are not delivered. You need to recommend a solution for ensuring that messages accepted by either Edge Transport server are attempted for delivery if either Edge Transport server fails.

What should you recommend?

A.
Enable back pressure.

B.
Enable shadow redundancy.

C.
Create a new send connector.

D.
Create a new remote domain.