Which technology is primarily used by 'smart shelves' in retail to detect product availability without requiring individual item scanning?

Smart shelves are transforming retail through IoT technology, allowing stores to track inventory in real-time, adjust pricing dynamically, and gather valuable consumer behavior data. These intelligent systems can detect when products are running low, analyze shopping patterns, and even interact with customers' smartphones to deliver personalized promotions. Test your knowledge about this innovative retail technology that's changing how physical stores compete in the digital age.

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RFID (Radio Frequency Identification) sensors
Bluetooth beacons
QR code recognition cameras
Thermal imaging sensors