Your Exchange Server 2007 environment has an Edge Transport server in the perimeter network and a Hub Transport server in the internal network. You configure Exchange EdgeSync service between the two servers. Your company merges with a company named Trey Research. Trey Research uses a third-party messaging server. Both companies will share the same address space. E-mail for the combined companies will route through the Exchange 2007 environment. You update the public DNS records for Trey Research to point to the Edge Transport server in your Exchange 2007 environment. You configure the Trey Research domain to be an accepted domain. You need to ensure that external e-mail for Trey Researchs users is sent to Trey Researchs third-party messaging server. What should you do?

A.
Configure an internal relay domain on the Edge Transport server. Create a Send connector on the Hub Transport server that points to Trey Researchs messaging server

B.
Configure an external relay domain on the Edge Transport server. Create a Send connector on the Edge Transport server that points to Trey Researchs messaging server

C.
Configure an internal relay domain on the Hub Transport server. Create a Send connector on the Hub Transport server that points to Trey Researchs messaging server

D.
Configure an external relay domain on the Edge Transport server. Create a Send connector on the Edge Transport server that points to the Hub Transport server