Which technology do most retail 'smart shelves' primarily use to detect inventory levels and provide real-time stock information?

The Internet of Things (IoT) is transforming retail operations through innovative technologies that enhance customer experience, improve inventory management, and provide valuable data insights. Smart shelves represent one of the most impactful IoT innovations in modern retail environments. Test your knowledge about this cutting-edge retail technology that's changing how stores manage inventory and interact with customers.

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RFID (Radio-Frequency Identification) sensors
Bluetooth Low Energy (BLE) beacons
Facial recognition cameras
Pressure-sensitive floor mats