Which innovative feature did Book of the Month Club introduce in 2016 that revolutionized its subscription model and significantly boosted its appeal to millennial readers?

The subscription box model revolutionized how readers discover new books and literary merchandise. These curated boxes have become increasingly sophisticated in their personalization algorithms and delivery methods. Test your knowledge about one of the most successful literary subscription services that changed how readers connect with books!

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Member choice selection among 5 new releases each month, replacing the single pre-selected book model
Automated book recommendations based on users' social media activity
Integration with smart home devices to deliver audio versions of selected books
Blockchain-verified first edition authentication system