In which year and country was the first commercially successful self-checkout system installed in a retail store?

The retail landscape has been transformed by numerous technological innovations over the decades. One of the most impactful developments for customer experience and operational efficiency has been the self-checkout system. This invention changed how customers interact with stores, reduced wait times, and revolutionized staffing models. But do you know when and where this retail innovation first appeared? Test your knowledge about this pivotal retail technology milestone!

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1992 in the United States (Price Chopper supermarket in New York)
1987 in Japan (Aeon department store in Tokyo)
1998 in the United Kingdom (Tesco supermarket in London)
2001 in Germany (Aldi discount store in Berlin)