Your network contains an Active Directory forest. The forest contains two domain controllers. The domain controllers are configured as shown in the following table. All client computers run Windows 7. You need to ensure that all client computers in the domain keep the same time as an external time server. What should you do（）
- AFrom DC1， run the time command.
- BFrom DC2， run the time command.
- CFrom DC1， run the w32tm.exe command.
- DFrom DC2， run the w32tm.exe command.