Which of the following capabilities is NOT currently a standard feature of smart shelf technology in grocery stores?

In today's competitive food retail environment, technology is transforming how grocery stores interact with customers and manage inventory. Smart shelves represent one of the most innovative developments in this space, combining IoT technology with traditional retail fixtures to create more efficient and personalized shopping experiences. Test your knowledge about this cutting-edge retail technology that's changing the way consumers shop for food products.

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Real-time inventory monitoring that automatically alerts staff when products need restocking
Digital price displays that can be updated remotely and show personalized pricing based on customer loyalty data
Automated taste sampling systems that dispense microscopic flavor particles when customers hover near premium food items
Sensors that track shopper behavior and product interaction to optimize store layouts and product placement