Which invention, first used commercially in 1974 at an Ohio supermarket, revolutionized retail by allowing automated checkout and inventory tracking?

The evolution of retail technology has transformed how consumers shop and how retailers analyze customer behavior. One technological breakthrough in particular revolutionized inventory management and dramatically changed the retail landscape worldwide. Test your knowledge about this pivotal invention that bridged the physical and digital retail worlds before the internet era became mainstream.

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Universal Product Code (UPC) barcode
Electronic price tag system
RFID inventory tracking
Digital cash register