You have an Exchange Server 2010 organization that contains two Hub Transport servers.  You need to design a recovery plan for the Hub Transport servers that meets the following requirements： .Restores all Windows settings .Restores all Exchange configurations.Minimizes administrative effort What should you include in the plan？（）

• A、.Retention of Exchange server computer accounts in Active Directory .Backup and recovery of Windows system stateA recovery installation of Exchange Server 2010
• B、.Retention of Exchange server computer accounts in Active Directory .Backup and recovery of transport queues.A custom installation of Exchange Server 2010
• C、Recovery of Windows system state.Backup and recovery of transport queues.A typical installation of Exchange Server 2010
• D、Backup and recovery of Windows system state.A repair installation of Windows Server 2008.A typical installation of Exchange Server 2010