Which innovative marketing approach did Elon Musk use when first introducing the Hyperloop concept to the public in 2013?

The transportation industry is constantly evolving with innovative concepts that challenge traditional mobility. One of the most talked-about developments in recent years has been the Hyperloop technology. This poll tests your knowledge about the marketing and product launch strategies behind this revolutionary transportation concept. Can you identify the correct information about the original Hyperloop announcement that changed the transportation industry's perspective on high-speed travel?

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Released a detailed 58-page open-source white paper instead of a traditional product launch, encouraging engineers worldwide to develop the concept
Created an invitation-only VR experience where select investors could virtually ride in a Hyperloop pod before the physical prototype existed
Launched a functional small-scale prototype at a global transportation expo with live demonstrations for industry leaders
Introduced the concept through an interactive mobile game app that simulated Hyperloop travel between major cities