Which company first introduced the world's first self-checkout system in retail, and when?

The retail landscape has been transformed by numerous technological innovations over the decades. One invention that dramatically changed how we shop was the self-checkout system. This innovation reduced waiting times, allowed retailers to reallocate staff resources, and gave customers more control over their shopping experience. But do you know when and where this revolutionary retail technology first appeared? Test your knowledge of retail innovation history!

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Walmart in 1992, with their 'Checkout Express' system in Arkansas
IBM and NCR collaboration in 1998, first deployed at Kroger supermarkets
David R. Humble's CheckRobot company in 1986, first tested at Kroger in Atlanta
Amazon in 2016, with their Amazon Go 'Just Walk Out' technology