An expert system: is accurately described by all of the above. last option.
An expert system in artificial intelligence is a computer program that mimics the capacity for judgment of a human expert. Expert systems are created to reason through knowledge bases that are primarily represented as if-then rules rather than through traditional procedural code.
The primary goal of ES is to reproduce the knowledge and expertise of human specialists in a particular field and then to apply this information to solve issues of a similar nature without the involvement of human experts.
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