You work as the enterprise exchange administrator at TestKing.com. TestKing.com makes use of Microsoft Exchange Server messaging solution. The TestKing.com network consists of a single ActiveDirectory domain named testking.com. TestKing.com is configured to run an exchange 2010 environment.TestKing.com consists of different departments， where the Active Directory user objects of every department resides in a separate organizational unit （OU）. All TestKing.com employees are a menber of aseparate Exchange distribution group for their respective department.During the course of the day youreceive an instruction from the CIO to assign administrative rights to the managers in the various departments. You need to ensure that the managers are not permitted to chare the mail flow settings or e-mail address of a group. However， they should be permitted to alter the distribution group membership ofthe department in their department. What should you do？（）

A. The best option is to assign the MyDistributionGroupMemberShip management role for each department manager.
B. The best option is to change der Managed By settings for each department distribution group.
C. The best option is to assign the department manager the Charge permissions for each department manager.
D. The best option is to change the message moderation settings for each department distribution group.