You need to avoid granting the vendor access to your internal network resources

You have an Exchange Server 2007 environment. You need to include the e-mail address for a specific vendor in your companys global address list (GAL). You need to avoid granting the vendor access to your internal network resources. What should you do?

A.
Create a mailbox-enabled user

B.
Create a mail-enabled user

C.
Create a Microsoft Exchange recipient object

D.
Create a mail contact