You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You plan to use a PresentationTraceSources object when the application is executed by users. When the application is executed in a test environment, all debug information is successfully captured. You need to be able to capture debug information when the application is deployed. What should you do?（）

• A、 Enable WPF tracing in the registry.Restart the application.
• B、 Enable tracing by modifying local Group Policy.Restart the application.
• C、 Open the XML configuration file for your application on the user's computer.Set tracing to a verbose level.Restart the application.
• D、 Open the XML configuration file for your application on the user's computer.Add a trace listener.Restart the application.