Which novel's marketing campaign included creating fake websites, social media accounts, and real-world 'evidence' that made readers believe the fictional story might actually be true?

In the competitive world of publishing, innovative marketing strategies have transformed how books reach readers. One particular campaign revolutionized book promotions by creating an immersive experience that blurred the line between fiction and reality. This poll tests your knowledge of groundbreaking literary marketing that changed the industry.

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The Da Vinci Code by Dan Brown
The Blair Witch Project Book (companion to the film)
Night Film by Marisha Pessl
S. by Doug Dorst and J.J. Abrams