Which military communications technology, developed during World War II, eventually evolved to become the foundation for modern retail inventory management and checkout systems?

Throughout history, military innovations have often made their way into retail spaces, transforming how consumers shop and businesses operate. From RFID technology (originally developed for aircraft identification) to GPS systems that now power delivery tracking, military tech has revolutionized retail. This trivia question explores how one of history's most significant military communications innovations eventually transformed the retail landscape worldwide.

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Barcode technology (originated from Morse code transmission systems)
RFID chips (developed from radar identification friend-or-foe systems)
Digital encryption (created for secure battlefield communications)
Electronic computers (ENIAC was originally designed for artillery firing tables)