You have a server that runs Windows Server 2008 R2. You plan to install Exchange Server
2010 on the server.
You need to install the Exchange Server 2010 prerequisites for the Unified Messaging (UM),
Mailbox, Client Access, and Hub Transport server roles.
What should you run?

A.
Setup.com /AnswerFile:Exchange-All.xml

B.
Setup.com /Roles:HT, MB, UM, CA, MT

C.
ServerManagerCmd.exe -IP Exchange-All.xml

D.
ServerManagerCmd.exe -IP Exchange-CADB.xml

Explanation:
http://technet.microsoft.com/en-us/library/bb691354.aspx
http://exchangeserverpro.com/installing-exchange-server-2010-pre-requisites-on-windowsserver-2008-r2