Which of the following is NOT a current capability of IoT-powered smart shelves in grocery stores?

The food retail industry is rapidly evolving with IoT technologies transforming how grocery stores operate and interact with customers. Smart shelves represent one of the most significant Retail IoT innovations, changing inventory management and customer experience in supermarkets and specialty food stores. Test your knowledge about this cutting-edge technology that's reshaping how we shop for groceries and how retailers manage their food products.

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Automatic inventory tracking that alerts staff when products need restocking
Real-time price updates across digital shelf tags store-wide
Analyzing shopper facial expressions to determine product satisfaction
Temperature monitoring for refrigerated food products to ensure freshness