What was unique about Tesla's original logo design before it adopted the current 'T' symbol?

Tesla has revolutionized the transportation industry with its electric vehicles and cutting-edge technology. Beyond their innovative products, their brand identity has evolved over time. This poll tests your knowledge about a lesser-known aspect of Tesla's visual branding history that showcases how even the most recognizable transportation companies undergo design transformations.

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It featured a full 'TESLA' wordmark with lightning bolts on either side
It contained elements of Nikola Tesla's AC motor designs incorporated into a shield
It showed a stylized electric plug wrapped around the letter E
It displayed a minimalist outline of the Roadster, Tesla's first production vehicle