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What is a rational agent?

  • A.One whose reasoning process mirrors that of a thoughtful human being
  • B.One that never makes an error in any of the decisions it takes
  • C.One that acts to maximise its expected performance measure
  • D.One that always achieves the best possible outcome in every situation

Answer: C

Rationality is defined relative to a performance measure, the agent's knowledge and the actions available, so a rational agent does the best it can with what it has rather than achieving perfection. Omniscience is not required and is not achievable. Human resemblance is a different criterion, and errors caused by incomplete information do not make an agent irrational. Defining rationality relative to available information is what makes it a usable engineering criterion.

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