Which marketing innovation is credited with helping 'The Night Circus' by Erin Morgenstern achieve its cult status despite modest initial sales projections?

The publishing industry has evolved dramatically with digital marketing transforming how books reach readers. Publishers and authors now employ sophisticated analytics to understand reader preferences, target audiences, and extend the customer lifetime value of literary enthusiasts. Test your knowledge about the innovative marketing strategies that have revolutionized book promotion and created literary phenomena in recent years!

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An immersive website where fans could explore the mysterious circus through interactive elements, extending the reader experience beyond the book
A traditional national billboard campaign featuring quotes from the book
Celebrity endorsements from major Hollywood actors who wanted to adapt it for film
A limited edition hardcover that included scratch-and-sniff elements to evoke the circus atmosphere