Certkiller .com has a main office and branch office in another city. You are assigned to deploy and implement a Read-only Domain Controller （RODC） at the branch office. You deploy a RODC that runs Windows Server 2008.  What should you do to ensure that the users at the branch office can log on to the domain using RODC（）

• A、Use Password Replication Policy on the RODC
• B、Add RODC to the main office
• C、Deploy and configure a new bridgehead server in the branch office
• D、Deploy and configure a Password Replication Policy on the RODC in the main office