Which military technology innovation was repurposed after WWII to revolutionize retail inventory management and eventually led to the development of modern barcodes?

The intersection of military technology and retail is more significant than most people realize. Throughout history, numerous innovations developed for military purposes have revolutionized how products are sold and distributed to consumers. This trivia question explores one of the most transformative military technologies that fundamentally changed global retail operations. Test your knowledge about how warfare innovation reshaped our shopping experience!

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RFID technology originally used for identifying friendly aircraft
Radar-based motion sensors developed for detecting enemy movements
Digital encryption systems used for secure communications
Harvard's electromagnetic memory drum computer technology designed for artillery calculations