A. Touchscreen displays
B. Light-emitting diodes (LEDs)
C. Microprocessors
D. Bitmapped displays

Solution

D. Bitmapped displays

Explanation

Bitmapped displays, which allow images to be displayed as arrays of pixels, enabled the development of graphical user interfaces (GUIs) by providing the ability to render graphical elements, icons, and windows on computer screens. The Apple Macintosh was one of the first computers to popularize GUIs.