Marty is developing a new way to heat an airplane's windshield to prevent it from accumulating ice when in flight. A thin layer of clear, conductive material is injected between two layers of thick windshield plastic. A very small electric current is run through the inner material to keep the plastic layers warm. How might using a model help Marty develop his design? A. A model could be used for automobile windshields. B. Airplane manufacturers could be sold models to use in their new planes. C. Marty could use a model to discover a new type of plastic for windshields. D. A model could be used to test his design in a lab.