Which IoT retail innovation was first implemented at London's Heathrow Airport in 2018, reducing inventory management time by 60% while increasing retail sales by 23%?

The transportation industry has been revolutionized by Internet of Things (IoT) technology, particularly in retail operations at transit hubs. Modern airports, train stations, and bus terminals have leveraged IoT to transform the passenger shopping experience while increasing operational efficiency. Test your knowledge about a groundbreaking IoT retail innovation that changed how transportation hubs manage their retail operations!

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RFID-enabled Smart Shelves that automatically track inventory in real-time and trigger replenishment orders
Personalized Digital Price Tags that change pricing based on flight delays and passenger demographics
Autonomous Retail Robots that restock shelves and guide passengers to products during off-peak hours
Biometric Payment Kiosks that allow travelers to make purchases using facial recognition without physical payment methods