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Which is omitted in prolog unification algorithm?

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in Artificial Intelligence by (105k points)
Which is omitted in prolog unification algorithm?

(a) Variable check

(b) Occur check

(c) Proposition check

(d) Both Occur & Proposition check

This question was addressed to me in final exam.

This interesting question is from Backward Chaining topic in section Logical Agents of Artificial Intelligence

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Right option is (b) Occur check

Explanation: Occur check is omitted in prolog unification algorithm because of unsound inferences.

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