You have a computer that runs Windows Vista. You publish your Windows Calendar to C:/Calendars/mycalendar.ics. A user subscribes to your published calendar. You create a new appointment. The user reports that the appointment only appears on his calendar 24 hours later. You need to reduce the amount of time it takes for the appointment to appear in the user’s view of the published calendar. What should you do?（）

• A、A
• B、B
• C、C
• D、D