Your company has a main office and 20 branch offices. Each office contains an Exchange
Server 2010 Mailbox server and an Exchange Server 2010 Hub Transport server.
Each office is configured as a separate Active Directory site. Each branch office site has one
IP site link that connects to the main office site.

You need to ensure that all email sent between offices is routed through the Hub Transport
server in the main office.
What should you do?

A.
From the Exchange Management Shell, run the Set-ADSite cmdlet.

B.
From the Exchange Management Shell, run the Set-ADSiteLink cmdlet.

C.
From the Exchange Management Console, modify the Receive connector for the Hub
Transport server in the main office.

D.
From the Exchange Management Console, create a new Send connector for each branch
office. Configure the Hub Transport server in the main office as a source server for each
Send connector.

Explanation:

http://technet.microsoft.com/en-us/library/bb124548