In which country was the world's first self-checkout system invented and when was it first commercially implemented?

The way we shop has evolved dramatically over the decades, with technological innovations continuously reshaping the retail experience. One particular innovation revolutionized how customers complete their purchases, promising shorter lines and greater efficiency. Test your knowledge about this significant retail development that changed store layouts and customer flow patterns forever!

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United States, 1992 (by Dr. Howard Graham at NCR Corporation)
Japan, 1987 (by Toshiba's retail division)
United Kingdom, 1995 (by Mark Draper at Sainsbury's)
Germany, 1990 (by Siemens Retail Solutions)