Which of these revolutionary retail technologies was first invented and implemented in stores?

The retail landscape has been transformed by numerous technological inventions and discoveries throughout history. From the humble barcode to sophisticated AI-powered systems, these innovations have revolutionized how we shop and how retailers operate. This trivia question tests your knowledge about a pivotal invention that changed retail forever. Can you identify which groundbreaking technology was introduced first and set the stage for modern retail operations?

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The barcode scanner, first used at Marsh Supermarket in 1974 on a pack of Wrigley's gum
The electronic point-of-sale (EPOS) system, first implemented by McDonald's in 1978
The magnetic stripe card reader, first used for retail purchases at Sears in 1980
The touchscreen self-checkout kiosk, first deployed by Tesco in 1982