You have a DNS server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Server1 is a stand-alone server. You perform a full backup of Server1 every day. A DNS zone on Server1 is deleted by using the DNS snap-in. You need to restore the DNS zone on Server1. What should you do?（）

A. Restore the system state data.
B. Restore all files in the %systemroot%\DNS folder.
C. Restore all files in the %systemroot%\System32\drivers\etc folder.
D. Copy all files from the %systemroot%\DNS\Backup folder to the %systemroot%\DNS folder.