You work as an Exchange Administrator for Xxx .The company has a Windows 2008 Active Directorybased network.You have just finished deploying an Exchange 2010 server and migrating all mailboxes including resource mailboxes from Exchange Server 2003. After the migration from the Exchange 2003 server was complete， you noticed that the resource mailboxes were showing up as a shared mailbox and not a resource mailbox.You realize that you need to convert them to Exchange 2010 resource mailboxes.While logged into the Exchange Management Console， you do not see any option to convert a mailbox.What should you use to convert this Exchange 2010 shared mailbox to an Exchange 2010 resource mailbox？（）
- AExchange Troubleshooting Assistant
- BExchange System Manager
- CExchange Management Shell
- DCommand prompt