Which invention, first used commercially in 1974, revolutionized retail inventory management and is considered one of the most significant retail innovations of the 20th century?

The world of retail has been transformed by numerous technological inventions throughout history. Some innovations completely changed how products reach consumers, how we pay for them, and how merchants track inventory. This trivia question focuses on a pivotal invention that fundamentally altered the retail landscape and created new possibilities for product tracking and sales analytics. Test your knowledge about this revolutionary retail technology!

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Universal Product Code (UPC) barcode
Electronic point-of-sale (EPOS) system
Radio-frequency identification (RFID) tags
Electronic shelf labels (ESL)