You have a hosted Exchange organization.All servers in the organization have Exchange Server 2010 Service Pack l （SP1） installed.The organization contains a distribution group named Group1.You need to ensure that a user named User1 can review and approve all messages sent to Group1. What should you do？（）

• A、Modify the Managed By list for Group1.
• B、Create a new journal rule and specify User1 as the journal recipient.
• C、Modify the mail flow settings for User1.
• D、Modify the mail flow settings for Group1.