Which major product development issue caused Tesla to delay the initial production timeline of their Semi truck by approximately 3 years?

The transportation industry is undergoing a massive transformation with the shift toward electric vehicles. Major manufacturers are investing billions in EV development, but the journey hasn't been smooth. This poll tests your knowledge about a significant product development challenge that affected one of the most ambitious electric vehicle projects in recent years. Understanding these challenges provides insight into the complex reality of bringing revolutionary transportation products to market.

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Battery cell supply constraints and the need to develop new high-capacity cells
Autonomous driving software failures that couldn't meet safety regulations
Manufacturing capacity limitations at existing Tesla factories
Unresolved aerodynamic design flaws that significantly reduced the projected range