You are the Exchange administrator of the Xxx Corporation’s Exchange 2010 organization.You are  concerned about the total size of items that are stored in a public folder namedExpenseReport.Click the Exhibit （s） button to view the public folder configuration. Which of the following techniques should you use to determine the size of items and the attachments in the public folder？（）

• A、Run the following script： Get-PublicFolderItemStatistics -Identity "/ExpenseReport/2009"
• B、Click on the Statistics tab in the properties of the public folder with the Public Folder Management Console
• C、Use the MSExchangeIS Public object in System Monitor
• D、Use the MSExchangeIS object in System Monitor