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 e-mail sent between offices is routed through the Hub Transport
servers in the main office.
What should you do?

A.
From the Exchange Management Shell, modify the Exchange-specific site link costs.

B.
From the Exchange Management Shell, configure the main office site as a hub site.

C.
From Active Directory Sites and Services, modify the site link costs.

D.
From Active Directory Sites and Services, remove all IP site links and then create new
SMTP site links.