You work as the enterprise exchange administrator at Xxx .The Xxx network consists of a forest with a domain named xxx .The forest and domain functional levels are set at Windows Server 2003.The environment of Xxx currently makes use of Microsoft Exchange Server 2003 Service Pack 2 （SP2） as their messaging solution.You receive instruction from Xxx to migrate the messaging system to Exchange Server 2010.What action must you take to implement for the Microsoft Exchange Server 2010？（）

• A、You should run the adprep.exe /forestprep command.
• B、You should run the adprep.exe /domainprep command.
• C、You should run the setup.com /AnswerFile：Exchange-All.xml command.
• D、You should run the setup.com /PrepareAD command.