Which of these retail technology inventions was first introduced in a supermarket in Troy, Ohio in 1974, revolutionizing checkout processes worldwide?

The landscape of retail has been transformed by numerous technological innovations over the decades. Some inventions had modest beginnings but went on to revolutionize how we shop and pay for goods. This trivia question focuses on a pivotal retail technology that fundamentally changed the consumer experience worldwide and continues to evolve with modern advancements.

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Universal Product Code (UPC) barcode scanning
Electronic point-of-sale (EPOS) terminals
Self-checkout kiosks
RFID inventory tracking systems