Which retail analytics technology first enabled accurate customer traffic counting and heat mapping of shopper movements in physical stores?

Customer analytics has transformed how retailers understand and engage with shoppers. Advanced data collection and analysis techniques have become essential competitive tools in the modern retail landscape. This trivia question tests your knowledge of a significant analytics innovation that changed how retailers track and understand customer behavior in physical stores. How well do you know the technological developments that have shaped retail customer analytics?

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RFID (Radio-Frequency Identification) sensors embedded in shopping carts
Overhead stereoscopic cameras with computer vision algorithms
Bluetooth-enabled shelf sensors that detect customer proximity
Wi-Fi triangulation from customers' mobile devices