When was the world's first self-checkout system invented and installed in a retail store?

The retail landscape has been transformed by numerous technological innovations over the decades. One particular advancement changed how customers complete their shopping experience, reducing wait times and labor costs while increasing customer autonomy. This innovation, now ubiquitous in supermarkets and large retail stores worldwide, represented a significant shift in the customer checkout experience when it was first introduced. Test your knowledge about when this retail revolution began!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

1992, by Howard Schneider at a Price Chopper supermarket in New York
1984, by David R. Humble at a Kroger store in Atlanta
2001, by IBM at a Walmart Supercenter in Arkansas
1977, by NCR Corporation at a Safeway in California