We discussed a dual$-$function interface in class, which serves both as a display and a control mechanism, significantly transforming how we interact with computers. Identify the option from the list below that functions as both a display and a control device.

Lee, Buxton, and Smith$$s $(1985)$ Multi$-$touch Interaction

Ivan Sutherland$(1962)$ Sketchpad

Xerox Star$$s $(1981)$ Bitmapped Icons

Apple Macintosh$$s $(1984)$ Word Processing Application