Which groundbreaking feature was FIRST introduced by Amazon in their Amazon Go grocery stores that revolutionized shelf technology in food retail?

Modern grocery stores are embracing innovative technologies to enhance customer experience and optimize inventory management. One of the most transformative retail technologies in the food industry has been the development of smart shelves with weight sensors and digital displays. These high-tech shelf systems are changing how consumers interact with products and how retailers manage their stores. Test your knowledge about this retail innovation that's reshaping the food shopping experience!

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Computer vision and sensor fusion technology that eliminates checkout lines
Dynamic e-ink price tags that automatically update based on inventory levels
AI-powered shelf cameras that analyze customer facial expressions to gauge product satisfaction
Temperature-sensing shelves that alert staff when refrigerated products exceed safe temperature thresholds