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What is the overall summary of the planning topic?

  • A.Planning has been superseded entirely by reinforcement learning
  • B.Planning applies only to domains with fewer than a hundred actions
  • C.A structured representation enables heuristics that make search feasible
  • D.Planning problems are solved by exhaustive search of the state space

Answer: C

Everything in the topic follows from representing states and actions so that the structure is visible, which permits relaxations, heuristics and interaction analysis that atomic states could not support. Exhaustive search is hopeless, planning and learning are complementary, and domain size is not the limit. That a change of representation unlocks the techniques, rather than a cleverer search, is the same lesson constraint satisfaction taught, and it is worth carrying forward.

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