Your company has a main office and a branch office. All branch office administrators are members of a custom management role group.The role group is configured to allow members to manage recipients.The branch office administrators are also members of The Domain Admins security group. The organization contains one Exchange Server 2010 server. You discover that the branch office administrators can manage recipients in both offices. You need to ensure that the branch office administrators can manage recipients in their assigned branch office only.What should you do？（）

A. Create a new management role entry for the role group.
B. Create a management role assignment policy and associate the policy to the role group.
Create a management scope and associate the scope to the role group.Set a recipient filter for the management scope.
D. Remove the branch office administrators from the Domain Admins group.Add the branch office recipients to the role group.