Which retail giant's innovation lab first developed and implemented 'Just Walk Out' technology, allowing customers to shop without traditional checkout?

Test your knowledge about groundbreaking retail innovation labs that have revolutionized the shopping experience. Many major retailers have established innovation labs to experiment with cutting-edge technologies and concepts, but can you identify which company pioneered a particularly significant advancement in the retail space? This question focuses on innovation that bridged the gap between physical and digital retail experiences.

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Amazon (through Amazon Go stores)
Walmart (through Store No. 8 innovation lab)
Target (through Target Forward innovation center)
Kroger (through Kroger Technology & Digital innovation hub)