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How is a threat resolved?

  • A.By ordering the threat before the producer or after the consumer
  • B.By removing the threatening action from the plan entirely
  • C.By adding a new action to restore the deleted condition
  • D.By weakening the goal so the condition is no longer needed

Answer: A

Demotion places the threat before the causal link and promotion places it after, and the planner branches on the two possibilities. Removing the action would usually break whatever needed it, and restoration or goal weakening are not part of the standard algorithm. Having exactly two repairs for each conflict makes the search space well defined and the algorithm straightforward to state.

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