Which feature is NOT currently implemented in most commercial smart shelf systems used by major food retailers?

In today's competitive food retail landscape, technology is transforming how grocery stores track inventory and enhance customer experience. Smart shelves represent one of the most innovative IoT applications in food retail, combining weight sensors, digital displays, and real-time inventory tracking. How well do you understand this emerging technology that's changing the way we shop for food? Test your knowledge about the cutting-edge developments in grocery retail IoT!

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Automatic restocking alerts sent to store personnel when inventory runs low
Dynamic pricing that changes based on real-time product freshness data
Weight sensors that detect when products are removed from shelves
Digital displays showing product information and nutritional facts