Which innovative marketing campaign is credited with transforming J.K. Rowling's 'Harry Potter and the Philosopher's Stone' from an initially modest print run into a global phenomenon?

The publishing industry has seen numerous innovative marketing campaigns that transformed unknown books into cultural phenomena. These strategies often combine traditional publicity with groundbreaking approaches that capture the public imagination. Test your knowledge about one of the most influential marketing campaigns in literary history that revolutionized how books are promoted and sold.

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Scholastic's unprecedented school book fair exclusivity deal that created artificial scarcity
Bloomsbury's 'word-of-mouth' strategy, deliberately limiting initial publicity to create mystique among booksellers and librarians
The 'Golden Ticket' campaign where 50 books contained tickets for a studio tour with the author
The 'Platform 9¾' viral marketing stunt where actors in wizard costumes appeared at train stations nationwide