Which retailer's innovation lab developed and tested the patented 'Just Walk Out' technology that allows customers to shop without going through traditional checkout?

Retail innovation labs serve as experimental playgrounds where companies test new technologies and concepts before wider implementation. These labs have revolutionized shopping experiences through everything from augmented reality fitting rooms to automated checkout systems. Test your knowledge about one major retailer's secretive innovation hub that has produced numerous game-changing retail technologies.

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Amazon (with their Amazon Go stores)
Walmart (through their Store No. 8 tech incubator)
Target (via their Target Forward innovation center)
Kroger (through their Culinary Innovation Center)