You are a messaging professional at A. Datum Corporation. Your company uses a Microsoft Exchange Server 2007 messaging system. The SMTP domain name for your company is adatum.com.

Your company acquires a company named Contoso, Ltd. Contoso uses a Microsoft Exchange Server 5.5 messaging system. The SMTP domain name for Contoso is contoso.com.

All e-mail messages between the two companies are sent through the Internet. The companies implement a new WAN link to connect their offices. Routers are configured to enable network routing across the WAN.

You need to configure the Exchange Server 2007 computers to ensure that all the e-mail messages sent between A. Datum and Contoso are sent through the WAN link.

What should you do to configure the Exchange Server 2007 computers to ensure that all the e-mail messages sent between A. Datum and Contoso are sent through the WAN link?

A.
On an Edge Transport server at A. Datum, configure an SMTP Send connector to use the address space contoso.com and external Domain Name System (DNS) lookups.

B.
On a Hub Transport server, configure an SMTP Send connector to use the address space contoso.com and external Domain Name System (DNS) lookups.

C.
On an Edge Transport server at A. Datum, create a new SMTP Send connector. Configure the SMTP Send connector to use an SMTP server at Contoso as a smart host.

D.
On a Hub Transport server, configure an SMTP Send connector to use the address space contoso.com.
Configure the SMTP Send connector to use an SMTP server at Contoso as a smart host.