Which innovative data strategy did Amazon first implement that revolutionized book retail by creating personalized recommendations for readers?

The bookselling industry has been transformed by data analytics and market research. Major retailers have leveraged customer preferences, reading habits, and purchasing patterns to reshape how literature is sold and marketed. This poll tests your knowledge about how one particular retail giant revolutionized the bookselling landscape through its use of big data and consumer behavior analysis.

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Collaborative filtering system that suggested 'Customers who bought this also bought...'
Geographic heat mapping that tracked regional literary preferences by zip code
Sentiment analysis of book reviews to automatically categorize reading experiences
Time-based purchasing patterns that predicted seasonal literary trends