Which invention, first used commercially in a supermarket in 1974, used parallel black lines of varying widths to encode product information and revolutionized retail checkout systems?

Throughout retail history, technological innovations have transformed how consumers shop and interact with products. One technology in particular revolutionized inventory management and checkout systems worldwide, representing one of the most significant retail advancements of the 20th century. This invention dramatically reduced checkout times, improved inventory accuracy, and is now ubiquitous in retail environments around the globe. Test your knowledge about this groundbreaking retail technology discovery!

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Universal Product Code (UPC) barcode system
Radio Frequency Identification (RFID) tags
Electronic Article Surveillance (EAS) tags
Near Field Communication (NFC) chips