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（）

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（）