Which retail innovation was first introduced by Amazon and is now being adopted by several major food retailers to eliminate checkout lines?

As food retailers embrace new technologies to enhance customer experience, they're revolutionizing how we shop for groceries. From AI-powered inventory management to personalized nutrition recommendations, the grocery store of tomorrow looks remarkably different from traditional supermarkets. This trivia question explores one of the most innovative trends reshaping food retail that's gaining traction globally.

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Just Walk Out technology (computer vision and sensor fusion for automatic payment)
Blockchain-based food traceability systems
Hydroponic in-store farming displays
Autonomous food delivery drones