Your network contains an Active Directory domain. The domain contains two Active Directory sites  named Site1 and Site2. Site1 contains two domain controllers named DC1 and DC2. Site2 contains two  domain controller named DC3 and DC4.  
The functional level of the domain is Windows Server 2008 R2. The functional level of the forest is  Windows Server 2003.  
Active Directory replication between Site1 and Site2 occurs from 20：00 to 01：00 every day.  At 07：00， an administrator deletes a user account while he is logged on to DC1.  
You need to restore the deleted user account. You want to achieve this goal by using the minimum  amount of administrative effort.  
What should you do（）

Your network contains an Active Directory domain. The domain contains several domain controllers.  
All domain controllers run Windows Server 2008 R2.
You need to restore the Default Domain Controllers Policy Group Policy object （GPO） to the Windows  Server 2008 R2 default settings.  
What should you do（）