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

The retail landscape has been transformed by numerous inventions and discoveries throughout history. These innovations have changed how we shop, pay, and interact with products. This trivia question focuses on a pivotal invention that revolutionized retail inventory management and checkout processes worldwide. Test your knowledge about the technological breakthroughs that shaped modern commerce!

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Universal Product Code (UPC) barcode
Magnetic stripe card reader
Electronic cash register (ECR)
Radio-frequency identification (RFID) tag