502. An ________________ system has a stored knowledge base and an inference engine.

A. Expert
B. Centers
C. Control
D. MIS
✅ The correct answer is option A.
An Expert system has a stored knowledge base and an inference engine. Expert systems were among the first truly successful forms of artificial intelligence (AI) software. An expert system is divided into two subsystems: the inference engine and the knowledge base. The knowledge base represents facts and rules. The inference engine applies the rules to the known facts to deduce new facts.

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