When was the world's first commercial self-checkout system introduced to the public, revolutionizing retail operations?

Self-checkout technology has transformed how we shop, but its invention and implementation weren't overnight successes. This technology represents one of the most significant shifts in retail operations in the last few decades, changing customer experiences and store efficiency. Test your knowledge about this retail innovation that has become ubiquitous in modern stores worldwide.

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1992 by Howard Schneider at Price Chopper in New York
1984 by IBM at Kroger supermarkets
2001 by NCR Corporation at Walmart
1977 by David R. Humble after being inspired while waiting in a long grocery line