Which marketing innovation was primarily responsible for making J.K. Rowling's 'Harry Potter and the Deathly Hallows' the fastest-selling book in history during its 2007 launch?

The book publishing industry has evolved dramatically in how new titles are introduced to the market. From traditional bookstore launches to modern multimedia campaigns, publishers have developed sophisticated product launch strategies to create bestsellers. Test your knowledge about some of the most innovative and successful book marketing campaigns that transformed unknown manuscripts into cultural phenomena. How well do you understand the strategic marketing decisions that helped certain books break through in a crowded literary marketplace?

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The synchronized global midnight release events across bookstores, creating a cultural moment
The release of an interactive website where readers could unlock chapters before publication
The distribution of free sample chapters through public libraries worldwide
The simultaneous release of the book and its film adaptation