Which technology is NOT typically integrated into modern 'smart shelves' used in advanced food retail environments?

Retail technology has transformed how food products are displayed, monitored, and sold in modern supermarkets. One of the most significant advancements involves intelligent shelf systems that can track inventory, analyze consumer behavior, and even adjust pricing in real-time. These technological innovations are changing how we shop for groceries and how stores manage their food products. Test your knowledge about this cutting-edge retail technology in the food industry!

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RFID sensors that automatically track inventory levels and alert staff when restocking is needed
Digital price displays that can be updated remotely based on demand or time of day
Taste-sensing modules that analyze food freshness and automatically adjust sell-by dates
Weight sensors that detect when products are removed and help prevent theft