Which IoT technology has saved major retailers billions in inventory costs by reducing 'phantom inventory' (items shown as in-stock in systems but actually unavailable on shelves)?

The Internet of Things (IoT) has transformed modern retail operations in ways many consumers never see. Behind the scenes, IoT technologies are creating smarter stores, more efficient inventory management, and personalized shopping experiences. This trivia question explores one of the most impactful but lesser-known IoT innovations reshaping the retail landscape. Test your knowledge of how cutting-edge technology is revolutionizing the way we shop!

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RFID (Radio-Frequency Identification) tagging systems
Automated checkout cameras
Smart shopping carts with weight sensors
Bluetooth beacon customer tracking