Which recommendation algorithm technique did Netflix famously offer a $1 million prize to improve in 2009, dramatically advancing how streaming services suggest content to viewers?

Streaming platforms like Netflix, Hulu, and Amazon Prime have revolutionized how we consume film and television content. Behind these platforms are sophisticated recommendation systems that analyze our viewing habits to suggest new content. This poll tests your knowledge about how these entertainment recommendation algorithms work and how they've shaped the modern film and television landscape.

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Collaborative filtering
Content-based analysis
Contextual bandits
Deep reinforcement learning