Which of the following is NOT a common feature of smart shelf technology currently being implemented in major grocery chains?

Smart shelves are transforming the food retail landscape by combining IoT sensors, digital displays, and real-time analytics to revolutionize inventory management and customer experience. These technological innovations help reduce food waste, enable dynamic pricing, and create personalized shopping experiences. Test your knowledge about this cutting-edge retail technology that's changing how we shop for food!

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Weight sensors that automatically detect low inventory and trigger restocking alerts
Digital price tags that can be updated in real-time based on inventory levels or time of day
Facial recognition that creates personalized meal suggestions based on a customer's previous purchases
Temperature monitoring sensors that help maintain food freshness and reduce waste