Which food retail innovation first introduced the concept of 'dark stores' - dedicated fulfillment centers for online grocery orders that are not open to the public?

Test your knowledge about the cutting-edge technology transforming how we shop for food! The grocery delivery landscape has changed dramatically in recent years with new innovations making food shopping more convenient than ever. This trivia question focuses on a significant retail innovation that revolutionized the grocery delivery industry and changed consumer shopping habits forever.

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Instacart
Ocado
Amazon Fresh
Walmart Grocery