Which of these product design innovations, first used in 1974 on a pack of Wrigley's gum, revolutionized retail by enabling automated checkout and inventory tracking?

In the world of retail, certain product design innovations have fundamentally transformed how consumers shop. One invention in particular revolutionized the self-service retail model and is now used billions of times daily across the globe. Test your knowledge of this pivotal retail innovation that bridged product identification with inventory management and created entirely new possibilities for data analytics in retail.

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Universal Product Code (UPC) barcode
Magnetic strip price tag
RFID inventory chip
Electronic shelf label (ESL)