Which invention first enabled retailers to accurately track in-store customer movement patterns at scale, revolutionizing retail analytics?

In the world of retail data analytics, certain inventions have revolutionized how businesses understand consumer behavior. Before modern analytics platforms, retailers struggled to connect in-store behavior with meaningful insights. One particular technology breakthrough in the early 2000s fundamentally transformed how retail data was collected and analyzed, creating the foundation for today's sophisticated consumer behavior models. Test your knowledge about this pivotal moment in retail analytics history!

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RFID (Radio-Frequency Identification) tracking systems
Barcode scanners with integrated customer loyalty programs
Bluetooth-enabled shopping carts
Facial recognition security cameras