You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application has a mobile Web form that contains the following ObjectList control.  You create an event handler named ObjectListCtrl_ItemCommand.  You need to ensure that the ObjectListCtrl_ItemCommand handler detects the selection of the CmdDisplayDetails item.  Which code segment should you write？ （）

• A、A
• B、B
• C、C
• D、D