YouhaveanActiveDirectoryforestthatcontainsonedomainnamedcontoso.com.ThefunctionallevelofboththeforestandthedomainisWindowsServer2003.YouhaveanExchangeServer2003organization.AllservershaveExchangeServer2003ServicePack2（SP2）installed.YouplantotransitiontoExchangeServer2010.YouneedtopreparetheActiveDirectoryenvironmentforthedeploymentofthefirstExchangeServer2010server.Whatshouldyourun（）？
A.Setup.com/PrepareAD
B.Setup.com/PrepareDomain
C.Setup.com/PrepareLegacyExchangePermissions
D.Setup.com/PrepareSchema