Which of these retail innovations was first introduced to stores, revolutionizing inventory management and checkout efficiency?

The retail landscape has been transformed by groundbreaking inventions throughout history. From scanning technologies to digital payment systems, these innovations have revolutionized how we shop and how retailers operate. This trivia question focuses on a pivotal invention that changed retail forever, testing your knowledge of the technological milestones that shaped modern commerce. Can you identify which retail innovation truly disrupted the industry first?

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The barcode scanner, first used commercially at an Ohio Marsh supermarket in 1974 on a pack of Wrigley's chewing gum
The electronic cash register (ECR), first deployed by McDonald's in 1971 to streamline food service transactions
RFID inventory tracking, first implemented by Walmart in 1967 to monitor product movement throughout stores
The self-checkout kiosk, first tested by Kroger in 1969 to reduce checkout lines and staffing needs