Which of the below is not a type of printer?

Option (4) Microwave printer

Option4 Microwave printer is not a type of printer.

I fully agree Sir. In today's world there is another type of distinction. Inkjet that is for personal use and laser jet which use ink in the form of powder ( so the ink never dries up even after1 year) for commercial use. 

The correct answer for this month's quiz is number four. See Bubble Jet printer definition, LED printer definition, Thermal printer definition, or Microwave printer definition for additional information about the other printers listed in this month's poll.