Which of the following is NOT a primary function of IoT-enabled 'smart shelves' in modern grocery stores?

Modern grocery stores are embracing Internet of Things (IoT) technology to enhance customer experience and optimize inventory management. Smart shelves represent one of the most significant retail technology advancements in the food industry, using weight sensors, RFID tags, and digital displays to transform how we shop. Test your knowledge about this cutting-edge retail IoT innovation that's changing how consumers interact with food products in stores.

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Automatically alerting staff when products are low in stock
Changing prices dynamically based on demand and expiration dates
Analyzing customer facial expressions to determine product preferences
Tracking product temperature to ensure food safety compliance