You create a server control that inherits from WebControl. You need to enable the server control to emit markup for a new kind of mobile device. You must not alter the code in the server controls. Which two actions should you perform?（）
- A Create a class that inherits HtmlTextWriter and that can emit the new markup.
- B Create a class that inherits StreamWriter and that can emit the new markup.
- C Reference the class in the <capabilities> element of the new device's browser definition file.
- D Reference the class in the <controlAdapters> element of the new device's browser definition file.