Which retail recommendation system innovation did Netflix first introduce that fundamentally changed how streaming platforms suggest content to viewers?

The film and television industry has undergone massive digital transformation in recent years, particularly in how content is distributed and monetized. Streaming platforms have revolutionized traditional retail models, creating new revenue streams and changing how success is measured. This trivia question tests your knowledge about a significant retail innovation that transformed how studios and streaming services track and leverage viewer data.

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The Netflix Prize competition that crowdsourced its recommendation algorithm
The 'Because You Watched' feature that groups similar content
The star-based rating system later replaced by thumbs up/down
The personalized thumbnail images for the same content