Discussion
Three devices out of the four given below fall under the "locator devices" class EXCEPT :
Answer: A
The device that does not belong is the touch screen.
In the classification of graphic input devices, a locator device feeds coordinate positions to the computer by moving a pointer or cursor: the touch pad, the digitising (graphics) tablet and the joystick all work this way, steering a position that the program then reads.
A touch screen is treated separately in this grouping, because the user selects an item by touching it directly on the display rather than by steering a locator across the screen. That is why the key singles it out while the other three are counted as locators.
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