Which innovative brand storytelling approach did J.K. Rowling's publisher use to market the final Harry Potter book that broke sales records and created unprecedented anticipation?

In the competitive world of publishing and literature, effective brand storytelling can make the difference between a bestseller and a book that collects dust. Major publishing houses and successful authors have mastered specific storytelling techniques that create emotional connections with readers. This trivia question explores a famous literary brand storytelling success that transformed an author's career and created a cultural phenomenon.

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The 'Midnight Magic' campaign with synchronized global release events at exactly 12:01 AM, creating a shared worldwide reading experience
The 'Chapter Reveal' strategy, where each chapter was released weekly for free online before the book's publication
The 'Character Journey' approach, releasing standalone novellas about secondary characters in the months before the final book
The 'Interactive Ending' campaign, where fans could vote online for their preferred conclusion to the series