Which invention was originally developed to prevent grocery cashiers' repetitive motion injuries but ultimately revolutionized retail checkout worldwide?

The world of retail has been transformed by technological innovations that changed how we shop forever. Behind many of these revolutionary ideas are fascinating origin stories that few consumers know about. This trivia question explores the invention of a technology that fundamentally altered the retail landscape and continues to shape our shopping experiences today. Test your knowledge about the unexpected beginnings of everyday retail technology!

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Barcode scanner (created by IBM engineers in 1973)
Touch screen register (developed by EPOS systems in 1982)
Self-checkout kiosk (invented by David R. Ferguson in 1989)
Contactless payment terminal (designed by Mastercard researchers in 1995)