Which of the following is NOT a current capability of smart shelf technology in grocery stores?

Grocery stores are increasingly adopting technological innovations to enhance customer experience and optimize operations. One of the most intriguing developments is the implementation of 'smart shelves' - digital shelf technology that's changing how consumers interact with products and how retailers manage inventory. Test your knowledge about this cutting-edge retail innovation that's transforming the food industry landscape!

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Automatic inventory tracking that alerts staff when products need restocking
Digital price displays that can be updated remotely in real-time
Sensing shoppers' dietary preferences and automatically suggesting alternatives
Detecting when items are removed and providing product information to nearby mobile devices