You are the network administrator for your company. The network consists of a single Active Directory domain. All network servers run Windows Server 2003. The domain contains three domain controllers: DC1, DC2, and DC3. Each one hosts user data. DC1 experiences hard disk failure. You need to temporarily restore the user data to DC2. Which type of restoration should you perform? （）

• A、Automated System Recovery (ASR)
• B、normal
• C、primary
• D、authoritative