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What is the condition of variables in first-order literals?

(a) Existentially quantified

(b) Universally quantified

(c) Both Existentially & Universally quantified

(d) None of the mentioned

I had been asked this question in an interview for internship.

Query is from Forward Chaining in division Logical Agents of Artificial Intelligence

Select the correct answer from above options

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The correct answer is (b) Universally quantified

Best explanation: First-order literals will accept variables only if they are universally quantified.

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