Which of these revolutionary retail technologies was first introduced to consumers?

The retail landscape has been transformed by technological innovations that have revolutionized how we shop. From self-checkout kiosks to augmented reality fitting rooms, retail tech has evolved dramatically over the decades. This trivia question challenges you to identify which groundbreaking retail technology was introduced first, forever changing the shopping experience and setting the stage for future innovations. Test your knowledge of retail history milestones!

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Electronic barcode scanner (1974)
Online shopping cart feature (1994)
Contactless payment system (1997)
Self-checkout kiosk (1992)