Which retail technology invention, first used commercially in 1974 on a pack of Wrigley's gum, revolutionized inventory management and the customer checkout experience?

In the world of retail, certain inventions have dramatically transformed the customer experience and revolutionized how businesses operate. This particular innovation changed the face of retail by enabling merchants to track inventory automatically and speed up checkout processes worldwide. It represents one of the most significant technological leaps in retail history, saving billions of hours of manual labor and dramatically improving data accuracy. Test your knowledge about this game-changing retail technology!

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The Universal Product Code (UPC) barcode system
The electronic point-of-sale (EPOS) terminal
The magnetic stripe card reader
The electronic anti-theft security tag