You are the network administrator for your company. Your network consists of a single Active Directory domain. All network servers run Windows Server 2003. Each domain controller contains one disk that is configured with both the system partition and the boot partition. Every day, you use custom software to perform a full backup of user profiles and user data. The custom backup software provides a bootable floppy disk that includes the drivers for the backup media. Every Sunday, you run the Automated System Recovery (ASR) wizard on your domain controllers in conjunction with removable backup media. Data is backed up in a file named Backup1.bkf. One Monday morning, you install a new application on a domain controller named DC1. When you restart DC1, you receive the following error message: "NTLDR is missing. Press any key to restart." You need to bring DC1 back online as quickly as possible. What should you do?（）

A. Restart DC1 by using the installation CD-ROReinstall the operating system and restore the contents of the latest full backup by using the Restore wizard. Restart DC1.
B. Restart DC1 by using the installation CD-RORestore the contents of Backup1.bkf by using the ASR disk. Restart DC1.
C. Restart DC1 by using the bootable floppy disk. Copy the contents of Backup1.bkf from the backup media to C:\winnt. Restart DC1.
D. Restart DC1 by using the bootable floppy disk. Copy the contents of the ASR disk to C:\. Restart DC1.