Which invention, first used commercially in 1974 on a pack of Wrigley's gum, revolutionized retail by enabling automated checkout systems and inventory tracking?

The retail landscape has been transformed by numerous technological inventions and discoveries throughout history. Some innovations completely changed how we shop and how retailers connect with customers. This trivia question focuses on a groundbreaking technology that revolutionized product identification and tracking, enabling faster checkouts, improved inventory management, and opening the door to sophisticated loyalty programs and customer analytics.

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Universal Product Code (UPC) barcode
RFID tag
Magnetic stripe card
Electronic price tag