You have an Exchange Server 2010 server named Server1. Server1 has a single mailbox database named DB1. You configure deleted items to be retained for 30 days.  You need to ensure that each item that passes the retention period is removed daily between 2：00 and 6：00.  What should you do（）？ 

• A、Run the Set-RetentionPolicy cmdlet.
• B、Run the Start-ManagedFolderAssistant cmdlet.
• C、Modify the maintenance schedule for DB1.
• D、Modify the messaging records management （MRM） schedule for Server1.