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You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
The application contains a composite user control that includes a TextBox control named txtInput.
The user control will be hosted in a window and will have handlers for the text-changed event of txtInput.
You need to ensure that the application meets the following requirements:
Creates a text-changed event handler named Audit_TextChanged for the txtInput control.
Executes Audit_TextChanged even when specific handlers mark the event as handled.
Which code segment should you add to the constructor of the user control?（）
A.txtInput.TextChanged+=Audit_TextChanged;
B.AddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);
C.EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);
D. EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler (Audit_TextChanged), false);
