Which groundbreaking marketing technique did Warner Bros. use to promote 'Inception' that was revolutionary for film marketing in 2010?

Christopher Nolan's mind-bending film 'Inception' wasn't just a masterpiece on screen - it was also a marketing revolution. The film's promotional strategy created layers of mystery that mirrored its complex narrative, generating unprecedented audience engagement. This poll tests your knowledge of one of Hollywood's most innovative marketing campaigns that changed how studios promote high-concept films.

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An interactive dream-sharing website that allowed users to create and share dreams, mirroring the film's concept
The world's first major film campaign to use ARG (Alternate Reality Game) marketing with real-world puzzles and hidden online content
A series of 3D billboards that appeared to fold in on themselves when viewed from different angles
Releasing the entire first act of the film as a free mobile app one month before theatrical release