The correct answer is D. A touch terminal.
A touch terminal is a computer input device that allows a user to interact with a computer by touching the screen. Touch terminals are often used in point-of-sale (POS) systems, self-service kiosks, and other applications where users need to enter data or select options from a menu.
A digitizing tablet is a computer input device that allows a user to input data by drawing or tracing on a surface. Digitizing tablets are often used in graphic design, engineering, and other applications where users need to create or edit images.
Vector scanning is a method of scanning an image into a computer. Vector scanning creates a series of lines and curves that represent the image. Vector scanning is often used in computer graphics and printing.
A stylus is a pen-like device that is used to interact with a touch screen. Styluses are often used in tablets and smartphones.
E is not the correct answer because it is not a method of operator interaction with a CRT.