Which transportation innovation has Walmart specifically credited with enabling their expansion into previously unprofitable rural markets between 2018-2022?

The transportation industry has revolutionized how retailers deliver products to consumers. From autonomous delivery vehicles to drone technology, the last mile of the retail supply chain has seen dramatic innovations in recent years. This poll tests your knowledge of how transportation technologies are reshaping retail expansion strategies and enabling retailers to reach customers in previously inaccessible or unprofitable locations. How well do you understand the intersection of transportation and retail expansion?

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Hub-and-spoke delivery network using autonomous electric vans for final delivery
Hyperloop-based underground delivery tunnels connecting distribution centers to rural outposts
Airship-based floating warehouses with drone delivery capabilities
Self-driving semi-trucks with integrated micro-fulfillment centers