Which invention, first used commercially in 1974 at an Ohio supermarket, transformed retail checkout efficiency and is considered one of the most significant retail innovations of the 20th century?

The retail landscape has been transformed by numerous technological inventions throughout history. From simple mechanical devices to complex AI systems, these innovations have changed how consumers interact with products and how businesses operate. This trivia question focuses on a pivotal invention that revolutionized the retail checkout experience worldwide and continues to impact consumer behavior today.

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UPC Barcode Scanner
Electronic Cash Register (ECR)
Self-Service Checkout Kiosk
Credit Card Magnetic Stripe Reader