The correct answer is C, plotter.
A joystick is a pointing device that is typically used for controlling the movement of a cursor on a computer screen. It consists of a stick that is moved in two dimensions, and the movement of the stick is translated into movement of the cursor.
A programmable function box is a device that is used to control various functions in a computer program. It typically has a number of buttons that can be programmed to perform different tasks.
A touch terminal is a computer terminal that is operated by touching the screen. It is often used in public places, such as airports and train stations, to provide information to users.
A plotter is a device that is used to produce hard copies of drawings or other documents. It typically uses a pen or pencil to draw on paper or other media.
Of these options, only plotters are not considered a method of input control in a CAD system. This is because plotters are used to produce output, not input.