You have a file server that runs Windows Server 2008. The server has a shared folder. You need to receive a notifcation when a user stores more than 500MB of data int he shared folder. You must allow users to store more than 500MB of data in the shared folder.  What should you do（）？ 

• A、Create a soft quota
• B、Create a hard quota
• C、create an active screening file screen
• D、create a passive screening file screen