Which groundbreaking IoT precursor invention, patented in 1952, revolutionized retail inventory management before becoming ubiquitous in stores worldwide by the 1980s?

The retail landscape has been transformed by Internet of Things (IoT) technologies that connect physical shopping experiences with digital innovation. One breakthrough invention in particular revolutionized how retailers track inventory and manage supply chains. Test your knowledge about this game-changing retail technology that began as a humble invention but grew to become the backbone of modern retail operations worldwide.

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RFID (Radio-Frequency Identification) tag
Barcode (Universal Product Code)
Electronic Article Surveillance (EAS) tag
Magnetic stripe card reader