YourcompanyhasaWindowsServer2003ActiveDirectoryforestthatcontainsasingledomain.ThefunctionalleveloftheforestissettoWindows2000native.YouhaveanExchangeorganizationthatcontainsExchangeServer2003ServicePack2（SP2）and ExchangeServer2007ServicePack2（SP2）servers.YouplantotransitiontheorganizationtoExchangeServer2010.YouneedtoprepareActiveDirectoryfortheinstallationofthefirstExchangeServer2010server.Whatshouldyoudo（）？
A.SetthefunctionalleveloftheforesttoWindowsServer2003.
B.PreparethelegacyExchangepermissionsfromtheExchangeServer2010installationsourcefiles.
C.AddtheExchangeServer2010schemaextensionsbyusingtheExchangeServer2010installation sourcefiles.
D.UpgradealldomaincontrollerstoWindowsServer2008，andthensetthefunctionallevelofthe domaintoWindowsServer2008.
参考答案：A
