Which innovative feature is NOT currently available in commercial smart shelf technology for food retailers?

Smart shelves are transforming how grocery stores manage inventory and interact with customers. These technology-enabled systems use weight sensors, RFID tags, or computer vision to monitor product availability, detect misplaced items, and even analyze shopping patterns. Beyond inventory management, some advanced smart shelf systems can display dynamic pricing, nutritional information, or personalized offers when customers approach. How much do you know about this cutting-edge food retail innovation?

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Real-time inventory tracking that automatically alerts staff when products need restocking
Electronic shelf labels that can update prices dynamically based on demand, time of day, or expiration dates
Molecular scanning that instantly detects food contamination or spoilage without opening packaging
Personalized product information displays that activate when a customer's loyalty app is detected nearby