Which of the following is NOT a common feature of IoT-enabled 'smart shelves' in modern grocery stores?

IoT technology is transforming how grocery stores operate, particularly in inventory management and customer experience. Smart shelves represent one of the most innovative implementations of Retail Internet of Things (IoT) in food retail. These digitally-enhanced display units can track products, adjust pricing in real-time, and even interact with shoppers. How much do you know about this cutting-edge food retail technology that's changing the grocery shopping experience?

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Automatic inventory tracking using weight sensors and RFID technology
Dynamic pricing displays that can be updated remotely based on demand or expiration dates
Automatic temperature adjustment to extend the shelf life of fresh produce
Product information display when customers interact with or pick up products