单项选择题 Your company has a domain controller server that runs the Windows Server 2008 R2 operating  system. The server is a backup server. The server has a single 500-GB hard disk that has three partitions  for the operating system， applications， and data. You perform daily backups of the server.   The hard disk fails. You replace the hard disk with a new hard disk of the same capacity. You restart the  computer on the installation media. You select the Repair your computer option.  You need to restore the operating system and all files.   What should you do（）

单项选择题 Your company has an Active Directory domain that runs Windows Server 2008 R2. The Sales OU   contains an OU for Computers， an OU for Groups， and an OU for Users. You perform nightly backups. An administrator deletes the Groups OU.    You need to restore the Groups OU without affecting users and computers in the Sales OU.    What should you do（）

单项选择题 You have a domain controller that runs Windows Server 2008 R2. The Windows Server Backup   feature is installed on the domain controller.   You need to perform a non-authoritative restore of the domain controller by using an existing backup file. What should you do（）