单项选择题YouworkastheenterpriseexchangeadministratoratCompany.com.TheCompany.comnetworkconsistsofasingleActiveDirectorydomainnamedCompany.com.Company.comhasanExchangeServer2010organization.Company.comcontainsthreeserversnamed-sr11,-sr12and-sr13.theseserversareconfiguredasfollows:-sr11hasthefront-endroleinstalledandisrunningexchangeserver2003servicepack2.-sr12hastheback-endroleinstalledandisrunningexchangeserver2003servicepack2.-sr13hastheclientaccessroleandthemailboxroleinstalledandisrunningexchangeserver2010.youhavereceivedinstructionsfromtheciotomovethemailboxesfrom-sr12to-sr13.however,youneedtomakesurethagtheuserscanusethee-mailfacilities.Whatshouldyoudo?()
A.You should consider installing the Exchange Server 2010 Edge Transport server role.
B.You should consider removing the Exchange Server 2003 servers.
C.You should consider installing a new Exchange Server 2010 Client Access server and remove the Exchange Server 2003 front-end server.
D.You should consider installing the Exchange Server 2010 Hub Transport server role.