Which innovative product launch strategy helped J.K. Rowling's 'Harry Potter and the Deathly Hallows' break sales records by selling 8.3 million copies in its first 24 hours?

The publishing industry relies on strategic product launches to turn books into bestsellers. From carefully orchestrated release dates to author tours, publishers employ numerous tactics to maximize a book's impact. This poll tests your knowledge about one of the most innovative book launch strategies that revolutionized the literary world in recent years. Can you identify the correct marketing approach that changed how books reach readers?

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Midnight release parties at bookstores worldwide with synchronized global launch time
Pre-releasing the first three chapters as free digital content to build anticipation
Limited edition covers randomly distributed, creating a collector's market
Interactive augmented reality app that revealed plot hints before release