Which of these retail innovations was first introduced at an Ohio supermarket in 1974, using a pack of Wrigley's chewing gum as its first test product?

The history of retail innovation is marked by technological breakthroughs that forever changed how we shop. One particular invention revolutionized inventory management and checkout processes worldwide, becoming ubiquitous in stores of all sizes. This innovation represented a perfect intersection of computing technology and retail operations, solving numerous logistical challenges that had plagued merchants for centuries. Test your knowledge of this groundbreaking retail technology milestone!

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UPC barcode scanner system
Electronic credit card reader
Self-checkout kiosk
Digital price tag system