You work as a network Exchange administrator at Company.com.The Company.com network currently consists of a single Active Directory forest containing a single domain named Company.com.The Company.com organization makes use of Microsoft Exchange Server 2010 as their messaging solution.Company.com has recently configured a user named Rory Allen as a Delegate for a user named Dean Austin.During the course of the business week you receive instruction from Company.com to ensurethat Rory Allen is able to add Dean Austin in the from field when sending messages whilst ensuring messages which contain Dean Austin in the From field should display Dean Austin s the message sender when the recipient receive the messages.  What should you do？（）

• A、You should consider having a Sharing policy created.You should then have Rory Allen granted Modify permission to Dean Austin’s mailbox.
• B、You should consider having a Sharing policy created.You should then have Rory Allen granted Full Mailbox permission to Dean Austin’s mailbox.
• C、You should consider having Rory Allen removed as a delegate.You should then have Rory Allen granted Send As permission to Dean Austin’s Mailbox.
• D、You should consider having Rory Allen removed as a delegate.You should then have Rory Allen granted Send on Behalf permission to Dean Austin’s mailbox.