Which innovative brand storytelling approach helped transform J.K. Rowling's 'Pottermore' from a simple author website into a major interactive platform that continued to engage readers years after the final Harry Potter book?

In the publishing world, brand storytelling has evolved into a sophisticated art form that connects readers to authors beyond the pages of their books. Major publishing houses and independent bookstores alike have embraced narrative-driven marketing to create deeper connections with literary audiences. This trivia question explores a groundbreaking brand storytelling technique that revolutionized book marketing in the digital age.

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Episodic content releases with 'hidden chapters' that revealed new storylines and character backgrounds not included in the original books
A subscription-based model where readers paid monthly fees to access exclusive interviews with the author
Fan fiction contests where winning entries became official canon in the Harry Potter universe
Virtual reality recreations of Hogwarts that allowed readers to attend classes with other fans in real-time