Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Input: Which of the following is not an alternative to rotary stepper motors: linear stepper motors, servomotors, or optical scanners?, Context: Stepper motors were and still are often used in computer printers, optical scanners, and digital photocopiers to move the optical scanning element, the print head carriage (of dot matrix and inkjet printers), and the platen or feed rollers. Likewise, many computer plotters (which since the early 1990s have been replaced with large-format inkjet and laser printers) used rotary stepper motors for pen and platen movement; the typical alternatives here were either linear stepper motors or servomotors with closed-loop analog control systems.
Output:
optical scanners