You have an organization that contains Exchange Server 2007 and Exchange Server 2010 Hub Transport servers.

You create a moderated distribution group named Group1.

You assign a user named User1 as the group’s moderator.

User1 reports that some e-mail messages are delivered to the members of Group1 without his approval.

You need to ensure that all e-mail messages deliverd to Group1 are approved by User1.

What should you do?

A.
Recreate the group as a dynamic distribution group.

B.
Restart the MSExchangeTransport Service

C.
Modify the expansion server for the group

D.
Force a replication between all domain controllers.