Your network contains an Active Directory domain named contoso.com.  
The network has a branch office site that contains a read-only domain controller （RODC） named  RODC1. RODC1 runs Windows Server 2008 R2.    
A user named User1 logs on to a computer in the branch office site. You discover that the  password of User1 is not stored on RODC1.    
You need to ensure that User1’s password is stored on RODC1.    
What should you modify（）

Your company has a main office and a branch office. The network contains an Active Directory  domain.  
The main office contains a writable domain controller named DC1. The branch office contains a  read- only domain controller （RODC） named DC2.  
You discover that the password of an administrator named Admin1 is cached on DC2.    
You need to prevent Admin1’s password from being cached on DC2.    
What should you do（）