You need to limit the size of the attachments that User1 can download by using Windows Mobile 6.5 devices

Your network contains one Exchange Server 2010 Service Pack 1 (SP1) Client Access
server named Server1.
You have a user named User1.
You need to limit the size of the attachments that User1 can download by using Windows
Mobile 6.5 devices.
What should you do first?

A.
Create new managed content settings.

B.
Modify the message size restrictions for User1.

C.
Create new Exchange ActiveSync mailbox policy

D.
Modify the default Exchange ActiveSync mailbox policy.