In which year was the first commercial self-checkout system installed in a retail store?

The retail landscape has been transformed by numerous technological innovations over the decades. Self-checkout systems revolutionized how consumers interact with stores, reducing wait times and changing staffing models forever. But do you know when this game-changing technology first appeared in retail stores? Test your knowledge of retail innovation history with this challenging question about a technology we now take for granted.

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1992, at Kroger supermarket in Atlanta
1984, at Walmart's flagship store in Arkansas
2001, at Marks & Spencer in London
1978, at Pathmark grocery store in New Jersey