Which unconventional marketing strategy helped Elon Musk's Hyperloop concept gain widespread attention and investment interest when it was first introduced?

The transportation industry has seen revolutionary changes in recent years, with companies investing heavily in innovative marketing strategies to promote new transportation concepts. One of the most talked-about transportation innovations, the Hyperloop, gained significant public attention through a particular marketing approach. Test your knowledge about how this futuristic transportation concept captured the imagination of investors and the public alike.

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Releasing a detailed 58-page open-source white paper instead of traditional advertising
Launching a series of celebrity-driven commercials featuring Leonardo DiCaprio
Creating a functional miniature model that toured major technology conferences
Hosting invitation-only VR experiences for potential investors in major financial centers