Your company purchases a company named Contoso, Ltd. Your company plans to accept e-mail messages that are sent to the contoso.com e-mail namespace on your companys existing e-mail servers. The Contoso, Ltd., e-mail servers will be decommissioned. You need to configure your companys Exchange 2007 organization to accept all e-mail messages that are sent to contoso.com.
What should you do?

A.
Add contoso.com to the accepted domains as an external relay domain.

B.
Add contoso.com to the accepted domains as an internal relay domain.

C.
Add contoso.com to the accepted domains as an authoritative domain.

D.
Add a new e-mail address generation policy for contoso.com.