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What is a sensing action?

  • A.An action that changes the world in a way the agent can perceive
  • B.An action performed only when the agent is uncertain about something
  • C.An action that fails when the agent cannot observe its outcome
  • D.An action whose effect is to reveal information about the state

Answer: D

A sensing action does not change the world but partitions the belief state according to what is observed, which is what allows a contingent plan to branch. Ordinary actions that happen to be observable are different, and the other options describe conditions rather than definitions. An action whose effect is epistemic rather than physical is a genuinely different kind of thing and requires its own treatment in the formalism.

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