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What is input resolution?

  • A.Resolution is applied only to the input's own unit clauses
  • B.Every step must involve one of the original input clauses
  • C.Only clauses read from the input file may be resolved
  • D.The input is resolved before any inference begins

Answer: B

Restricting one parent of every resolution to be an original clause keeps the search linear in shape, and it is complete for Horn clauses though not in general. That partial completeness is exactly why logic programming, which is Horn, can use such a restricted strategy. The other options misread the restriction. A strategy complete for a fragment and incomplete generally is usable precisely where that fragment applies, which must be checked rather than assumed.

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