Which retail technology innovation holds the Guinness World Record for 'most widely used retail tracking system' that revolutionized inventory management?

The retail industry has witnessed remarkable technological innovations throughout history, some of which have set impressive world records. These technological breakthroughs have transformed how retailers operate, track inventory, and serve customers. This trivia question focuses on a significant world record in retail technology that changed the industry forever. Test your knowledge about this pivotal retail tech milestone!

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UPC Barcode System (introduced by IBM in 1973)
RFID Tag System (introduced by Walmart in 1999)
Electronic Article Surveillance (introduced by Checkpoint in 1968)
QR Code System (introduced by Denso Wave in 1994)