The correct answer is: A. light pen
A light pen is a pointing device that allows a user to interact with a computer by pointing to displayed objects. It is a type of digitizer that works by sensing the light emitted from a cathode ray tube (CRT) screen. When the light pen is pointed at a specific location on the screen, the computer can determine the x, y coordinates of that location.
A digitiser is a device that converts analog information into digital information. It can be used to input data from a variety of sources, including drawings, photographs, and maps. Digitisers typically use a stylus or a puck to capture the data.
A Direct view storage tube (DVST) is a type of cathode ray tube (CRT) that is used to display computer graphics. It is a vector display, which means that it creates images by drawing lines on the screen. DVSTs are no longer commonly used, but they were once popular for displaying computer graphics.
A tablet is a flat surface that can be used to input data into a computer. It is typically used with a stylus or a pen. Tablets are often used for drawing, writing, and signing documents.
The correct answer is A. light pen.