You work as an Exchange Administrator for ABC Inc. The company has a Windows 2008 Active Directory-based network. The network contains an Exchange Server 2010 organization.

You have deployed Hub Transport, Client Access, Unified Messaging, and Mailbox servers in the messaging organization. You have not deployed any Edge Transport servers in the organization.

Which of the following servers can be used to send and receive email traffic across the Internet?

A.
The server configured with the Unified Messaging server role.

B.
The server configured with the Client Access server role.

C.
The server configured with the Mailbox server role.

D.
The server configured with the Hub Transport server role.