问题：
You have an Exchange Server 2010 organization.You need to use Role Based Access Control （RBAC） to provide a user the ability to manage recipients in a specific organizational unit （OU）.
What should you do first？（）
A . Create a new direct role assignment.
B . Create a new management role assignment policy.
C . Create a new management scope.
D . Modify the default management scope.
You have an Exchange Server 2010 organization.You need to use Role Based Access Control （RBAC） to provide a user the ability to manage recipients in a specific organizational unit （OU）.
What should you do first？（）
● 参考解析
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