Which groundbreaking retail technology invention, first used commercially in 1974, was initially rejected by retailers but eventually led to savings of over $17 billion annually in the grocery industry alone?

The retail landscape has been dramatically transformed by technological innovations throughout history. From the invention of the barcode to contactless payments, some discoveries have revolutionized how we shop and how retailers operate. This trivia question focuses on a pivotal invention that changed inventory management and checkout processes forever.

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Universal Product Code (UPC) barcode scanner
Electronic cash register (ECR)
Self-checkout kiosk
RFID inventory tracking system