Your network contains an Exchange Server 2010 server.  You need to plan a mailbox sharing solution for the organization to meets the following requirements：.Ensure that assistants can read and modify the e-mail messages of their managers .Ensure that assistants can impersonate their managers when they send e-mail messages  What should you include in the plan？（）

• A、Full Access and Send As permissions
• B、Full Access and send on behalf of permissions
• C、Role Based Access Control （RBAC） assignments and Send As permissions
• D、Role Based Access Control （RBAC） assignments and send on behalf of permissions