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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

Select the correct answer from above options

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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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