Which retail technology invention was first successfully implemented in a grocery store, revolutionizing inventory management and checkout processes?

The retail landscape has been transformed by numerous technological innovations throughout history. From barcode scanning to contactless payments, these inventions have revolutionized how we shop and how retailers operate. This trivia question focuses on a pivotal invention that changed retail operations forever, testing your knowledge of the timeline and impact of retail technology development. Can you identify which groundbreaking retail innovation truly transformed the industry first?

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RFID (Radio-Frequency Identification) tags - first used in 1973 at Walmart
UPC barcode scanning - first used in 1974 at Marsh Supermarket in Ohio
Electronic Point of Sale (EPOS) systems - first used in 1969 at Macy's department store
Self-checkout kiosks - first used in 1967 at Kroger supermarkets