Which AI system developed by DeepMind defeated the world's top human player in 'Go' in 2016?

The AI system developed by DeepMind that defeated the world's top human player in 'Go' in 2016 is AlphaGo. This achievement marked a significant milestone in the field of artificial intelligence, showcasing the system's ability to master a complex board game that had long been considered a challenge for computers due to its vast number of possible moves and the need for strategic thinking.

AlphaGo utilized advanced techniques including deep learning and reinforcement learning, allowing it to not only play the game at a high level but also to learn and improve through experience. The match against Lee Sedol, one of the best Go players in history, drew international attention and demonstrated the potential of AI in handling tasks that require intuition and pattern recognition, which are often seen as human strengths.

In contrast, other choices like AlphaZero, DeepMind Master, and NeuralGo either represent different projects or systems that are not specifically tied to this landmark game in 2016. AlphaZero, for instance, was developed later and is known for its versatility in playing multiple games, but it was not responsible for the historic win in Go that AlphaGo achieved.