Which of the following is NOT an output device?

Correct option is C

The correct answer is option (c): Scanner
Explanation:
An output device is a hardware component that displays, projects, or outputs information from a computer to the user in a readable or usable format.
Explanation of the Options:

• A. Monitor:
  An output device that displays visual information (text, images, videos) from the computer.
  Example: Computer screen, laptop display.
  
• B. Speaker:
  An output device that converts digital audio signals into sound waves.
  Example: Used to play music or alerts.
  
• C. Scanner (Not an Output Device):
  A scanner is an input device used to convert physical documents or images into digital form.
  It sends data into the computer, not out of it.
  
• D. Printer:
  An output device that produces a physical copy (hard copy) of digital documents or images.