Which of these product innovations was originally developed for military use during WWII before becoming a cornerstone of modern retail and logistics?

Throughout history, military necessity has driven countless product innovations that later transformed civilian life. From the internet to microwave ovens, many everyday technologies began as military projects. This trivia question explores one of the most significant product innovations that originated from military research during WWII but revolutionized civilian technology and commerce in ways the original developers could never have imagined.

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RFID (Radio-Frequency Identification) technology
Barcode scanning systems
Touchscreen display technology
Bluetooth wireless communication