Which of the following features is NOT currently available in smart shelf technology used in modern grocery stores?

In recent years, grocery retailers have been implementing various technologies to enhance the shopping experience and improve inventory management. One significant innovation has been the introduction of 'smart shelves' - digital shelf systems that can dynamically change prices, detect low stock, and interact with shoppers. This poll tests your knowledge about this retail technology that's changing how we shop for food.

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Real-time inventory tracking that automatically alerts staff when products need restocking
Digital price displays that can be updated instantly across the store from a central system
Taste-sampling sensors that let customers virtually sample food products before purchase
Customer recognition systems that can display personalized offers based on shopping history