You have Exchange Server 2003 organization. The organization contains a front end server named FE1 and a back end server accessible from the Internet by using mail.contoso.com. You plan to…

You have Exchange Server 2003 organization. The organization contains a front end server named FE1 and a back end server accessible from the Internet by using mail.contoso.com. You plan to transition the organization to Exchange Server 2010. You will deploy a Mailbox server named MIX1 and a Client Access server named CAS1. Users will access Outlook Web Access and Outlook Web App (OWA) by using the URL. https://mail.contoso.com. You need to recommend a DNS configuration for the external name of mail.contoso.com. Which server should be associated with the name mail.contoso.com?