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 Admin1s password from being cached on DC2.   What should you do（）

• A、Modify the NTDS Site Settings.
• B、Modify the properties of the domain.
• C、Create a Password Setting object （PSO）.
• D、Modify the properties of DC2s computer account.