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Which extension handles an unknown initial state without sensing?

  • A.Conformant planning over belief states
  • B.Probabilistic planning with a reward function
  • C.Temporal planning with concurrent actions
  • D.Contingent planning with branches on observations

Answer: A

Conformant planning searches over sets of possible states and seeks a sequence succeeding from every one of them. Contingent planning is the version with sensing available, and the other two relax different assumptions altogether. Distinguishing the case where the agent cannot observe from the case where it can, and knowing that the first admits a fixed sequence while the second requires a tree, is the essential difference between them. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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