Which groundbreaking marketing technique was first used for J.K. Rowling's 'The Casual Vacancy' in 2012 that changed how publishers promote literary fiction?

In the competitive world of publishing, marketing strategies can make or break a book's success. Publishers and authors have developed increasingly sophisticated approaches to engage readers and build anticipation. Test your knowledge about how the literary world has evolved its promotional techniques in the digital age, and discover which innovative marketing campaigns have revolutionized book launches and author platforms.

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Interactive audiobook excerpts with voice actor auditions voted on by fans
Holographic author readings appearing in multiple bookstores simultaneously
Digital billboard that displayed the book's first page, changing every minute to reveal more text
Augmented reality app allowing readers to see character backstories by scanning book cover