Which technology is NOT typically incorporated into modern smart shelf systems used in grocery stores?

The grocery industry is rapidly evolving with technology that enhances both the shopping experience and operational efficiency. One innovation changing how food retailers manage inventory and interact with customers is smart shelf technology. These digital shelving systems use various sensors and displays to transform the traditional shopping experience. Test your knowledge about this cutting-edge retail innovation transforming food stores worldwide.

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Weight sensors that detect when products are removed and automatically update inventory
Digital price displays that can be updated remotely in real-time
Biometric scanners that identify individual shoppers and customize product recommendations
Temperature monitoring sensors for refrigerated food sections