Which recommendation algorithm technique is most commonly used by major online bookstores to suggest 'If you enjoyed this author, you might also like...' recommendations?

The digital transformation of bookstores and libraries has revolutionized how readers discover new titles. Modern recommendation systems use sophisticated algorithms to connect readers with their next favorite book. But how much do you know about these literary matchmaking systems? This trivia question explores the technology that's reshaping how we find and consume literature in the digital age.

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Collaborative filtering based on reading patterns of similar users
Natural language processing of book reviews and summaries
Content-based filtering analyzing only literary genres and themes
Random forest algorithms prioritizing bestseller status