Which retail analytics technology, first widely adopted around 2010, revolutionized in-store customer tracking by providing heat maps of shopper movements without requiring mobile app installation?

In today's hyper-competitive retail environment, data analytics has transformed how businesses make decisions. From predicting consumer behavior to optimizing inventory management, retailers are leveraging sophisticated analytics tools to gain competitive advantages. This trivia question explores a pivotal innovation in retail analytics that changed how businesses understand customer behavior in physical stores.

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Wi-Fi triangulation systems
RFID-embedded shopping carts
Bluetooth Low Energy (BLE) beacons
Facial recognition cameras