Which marketing strategy revolutionized the Harry Potter series, helping it become one of the best-selling book franchises in history?

In the competitive world of publishing, marketing strategies can make or break a book's success. Throughout literary history, publishers have employed innovative approaches to capture readers' attention and drive book sales. This trivia poll explores one of the most successful and revolutionary marketing campaigns in publishing history that transformed how books reach audiences and created a cultural phenomenon.

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Midnight release parties that created event-based retail experiences
Releasing all seven books simultaneously as a complete set
Publishing adult and children's editions with identical content but different covers
Initially releasing the books exclusively through public libraries to build word-of-mouth demand