Which transportation innovation did Amazon first deploy in its warehouses in 2012 that revolutionized fulfillment center operations and was later acquired for $775 million?

The transportation industry has been dramatically transformed by retail supply chain innovations. Companies are constantly developing new methods to optimize delivery networks, reduce carbon footprints, and meet increasing consumer demands for faster shipping. This trivia question explores a significant technological advancement that changed how products move from warehouses to customers, representing a pivotal moment in retail-transportation integration.

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Kiva Systems' autonomous mobile robots
Ocado's automated grid system
Nuro's self-driving delivery vehicles
Starship Technologies' sidewalk delivery robots