Which marketing strategy was primarily responsible for turning J.K. Rowling's first Harry Potter book from a modest initial print run of 500 copies into a global phenomenon before the series gained mainstream recognition?

The publishing industry has seen many innovative marketing strategies that transformed unknown books into cultural phenomena. Some campaigns have been so revolutionary they changed how literature is marketed forever. This poll tests your knowledge of a groundbreaking marketing campaign that redefined book promotion and helped create one of the bestselling series in literary history.

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The publisher created an artificial scarcity by releasing limited copies with collector covers, driving demand through perceived exclusivity
Bloomsbury published separate adult and children's editions with different covers, allowing adults to read the book without embarrassment, expanding the market
The first book was simultaneously released as a free audiobook narrated by Stephen Fry, creating word-of-mouth momentum among commuters
Warner Bros. pre-purchased film rights and released teaser trailers for the movie adaptation before the book gained widespread popularity