Which innovative book-related product development trend generated over $250 million in merchandise sales in 2021, expanding the Harry Potter universe beyond traditional books?

The book publishing industry has undergone significant changes in how literature is marketed and merchandised. Beyond traditional books, publishers and authors now create extensive product ecosystems around popular titles and characters. This poll tests your knowledge of recent product development trends in the literary world that have transformed how readers engage with their favorite stories beyond the page.

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Interactive e-books with augmented reality features
Licensed Harry Potter subscription boxes containing exclusive collectibles
Harry Potter virtual reality gaming experiences
Author-narrated audiobook versions with original music scores