You have an Active Directory forest that runs Windows Server 2008.You have an Exchange Server 2010 organization that contains a Hub Transport server named Hub1.Hub1 fails.An administrator deletes the computer account and all other references of Hub1 from Active Directory.You need to replace the Hub Transport server role on a new server.You must achieve this goal by using the minimum amount of administrative effort.What should you do？（）

• A、On the new server， run Setup /M：RecoverServer
• B、On the new server， run the Exchange Server installation program and then select the Hub Transport role
• C、from Ntdsutil， perform an authoritative restore and then create a managed service account named Hub1
• D、from Ntdsutil， perform an authoritative restore and then create a CNAME record for Hub1 that points to the new server