You work as the enterprise exchange administrator at Company.com.The Company.com network consists of a single Active Directory domain named Company.com.Company.com has an Exchange Server 2010 organization.the Company.com contains an exchange server 2010 client access server named -ex12.Company.com has an employee named andy booth.he uses exchange activesync to down load attachment.You have received instructions from the cio to limit andy booth’s attachments size；however your action should not in any way affect the other employees at Company.com.What should you do？（）

A. The best option is to set up a new managed content setting.
B. The best option is to change Andy Booth’s message size restrictions.
C. The best option is to set up a new Exchange ActiveSync mailbox policy.
D. The best option is to change the default Exchange ActiveSync mailbox policy.