Which revolutionary supply chain strategy did Tesla implement with its Gigafactory that drastically reduced the traditional automotive industry's carbon footprint?

Tesla's approach to vehicle manufacturing has disrupted traditional automotive supply chains in numerous ways. One of the most significant innovations was the development of their Gigafactories - massive production facilities designed to vertically integrate battery and vehicle production. This poll tests your knowledge about how Tesla's supply chain innovations have transformed transportation manufacturing.

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Vertical integration of battery production, bringing lithium-ion cell manufacturing in-house rather than sourcing from overseas suppliers
Implementation of blockchain technology to track all vehicle components from raw materials to finished product
Exclusive use of hydrogen fuel cells for all factory operations and logistics
Complete outsourcing of all component manufacturing to specialized micro-factories within 50 miles of assembly plants