Which innovative marketing strategy helped propel 'The Blair Witch Project' (1999) to become one of the most profitable independent films of all time?

Hollywood blockbusters invest millions in marketing campaigns to ensure box office success. From viral stunts to strategic partnerships, film marketing has evolved into an art form of its own. This trivia question explores one of the most innovative film marketing strategies that fundamentally changed how movies are promoted and helped create one of the biggest cultural phenomena of recent years.

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Creating a fictional documentary website that presented the film as actual found footage, leading audiences to believe the events were real
Releasing all marketing materials exclusively on VHS tapes mailed to film critics and horror enthusiasts
Hosting nationwide screenings where audience members were required to sign legal waivers acknowledging psychological risks
Hiring actors to pose as the 'missing filmmakers' and make sporadic public appearances in major cities before the film's release