Your company has a domain controller that runs Windows Server 2008. 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（）

A. Select the Startup repair option.
B. Select the System restore option.
C. Run the Rollback utility at the command prompt.
D. Run the Wbadmin utility at the command prompt.