You have a portable computer that runs Windows XP Professional. When the computer is disconnected from the network, you receive a message in the notification area that says you are working offline. The message reappears every hour. You need to prevent the message from appearing while you are working offline. What should you modify?（） 

• A、Disk Quota settings
• B、My Documents properties
• C、Offline Files properties
• D、Synchronization settings