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？（）
- AFull Access and Send As permissions
- BFull Access and send on behalf of permissions
- CRole Based Access Control （RBAC） assignments and Send As permissions
- DRole Based Access Control （RBAC） assignments and send on behalf of permissio