You are a messaging professional. Your company uses a Microsoft Exchange Server 2007 messaging system.

The company uses a single Edge Transport server. Edge synchronization is enabled.

You need to ensure that all users can continue to exchange e-mail messages with users outside the Exchange organization in the event the Edge Transport server is unavailable.

Which two actions should you perform to ensure that all users can continue to exchange e-mail messages with users outside the Exchange organization? (Each correct answer presents part of the solution. Choose two.)

A.
Install an additional Hub Transport server. Reconfigure the Edge subscription to the Edge Transport server.

B.
Install an additional Edge Transport server on the perimeter network. Configure a new Edge subscription with the new Edge Transport server.

C.
Install an additional Edge Transport server on the perimeter network. Remove the existing Edge
subscription, and create a new Edge subscription for the new Edge Transport server.

D.
Configure new MX and A resource records in the private namespace Domain Name System (DNS) zone. Configure a new A resource record in the public namespace Domain Name System (DNS) zone.

E.
Configure new MX and A resource records in the public namespace Domain Name System (DNS) zone.
Configure a new A resource record in the private namespace Domain Name System (DNS) zone.