You manage 40 computers that run Microsoft Windows Vista.  You use Microsoft Windows Calendar to publish a calendar to a shared network location. You need to allow users to automatically view the most recent calendar updates.  What should you do？ （）

• A、Instruct all users to configure a calendar subscription that has an update interval of 15 minutes.
• B、Instruct all users to perform calendar synchronization for all shared calendar subscriptions. 
• C、Instruct all users to map a network drive to the folder that holds the shared calendar. Import the .ics file for the shared calendar.
• D、Use e-mail messages to deploy the .ics file for the shared calendar to each user. Instruct each user to import the .ics file that is attached to the e-mail message.