You have an Exchange Server 2010 Mailbox server.You need to identify which users have the largest mailboxes on the server.What should you do？（）
- ARun the Get-MailBoxStatistics cmdlet.
- BRun the Get-StoreUsageStatistics cmdlet.
- CAdd the MSExchangeIS Client performance counters to the Performance Monitor.
- DAdd the MSExchangeIS Mailbox performance counters to the Performance Monitor.