You work as the enterprise exchange administrator at Xxx .Xxx is using Microsoft Exchange Server 2010 as their messaging solution.It has come to the attention of Xxx management that a network user named Rory Allen is using Exchange ActiveSync to abuse the company’s e-mail policy by downloading huge attachments that does not pertain to his work detail.Consequently you receive instruction from Xxx to restrict the attachments size for Rory Allen’s to 100 KB. How can you achieve the goal by ensure that only Rory Allen is restricted？（）

A. You must set up a new ActiveSync Device Access rule.
B. You must set up a managed folder mailbox policy.
C. You must set up a new role assignment policy.
D. You must set up Outlook Protection Rules.