Which of these famous consumer products was originally developed as part of a US Navy-funded research project during WWII?

Throughout history, military technology companies have pioneered innovations that later transformed civilian markets. From radar to GPS, military R&D has shaped our modern world. This trivia question focuses on a famous product innovation that began as military technology before becoming a household item. Test your knowledge about the fascinating crossover between military development and consumer products!

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Microwave oven (created when engineer Percy Spencer noticed a radar magnetron melted a chocolate bar in his pocket)
Polaroid instant camera (developed for aerial reconnaissance to provide immediate field intelligence)
Jeep vehicles (designed exclusively for battlefield transport before civilian adaptation)
Super Glue (invented while attempting to create transparent plastic gun sights)