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Which component of an expert system holds the domain rules?

  • A.The knowledge base
  • B.The inference engine, which applies the rules to the facts supplied by the user
  • C.The working memory
  • D.The explanation facility, which reports how a conclusion was reached

Answer: A

The knowledge base stores the domain expertise as rules, frames or other structures, separate from the machinery that uses it. The inference engine applies that knowledge, working memory holds the facts of the current case, and the explanation facility reports the reasoning afterwards. This separation of knowledge from control is the defining architectural commitment of the field, and it is what makes a shell reusable across domains. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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