You need to ensure that a user named User1 can add and remove members from Group1

You have an Exchange 2010 organization. The organization contains a distribution group named Group1.

You need to ensure that a user named User1 can add and remove members from Group1. You must prevent User1 from modifying all other groups.

What should you do first?

A.
Add User1 to Group1’s Managed by list.

B.
Assign User1 as a group moderator for Group1.

C.
Assign the Distributions Groups management role to User1.

D.
Assign the MyDistributionGroups management role to User1.