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Which among the following could the Existential instantiation of ∃x Crown(x) ^ OnHead(x, Johnny)?

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Which among the following could the Existential instantiation of ∃x Crown(x) ^ OnHead(x, Johnny)?

(a) Crown(John) ^ OnHead(John, Jonny)

(b) Crown(y) ^ OnHead(y, y, x)

(c) Crown(x) ^ OnHead(x, Jonny)

(d) None of the mentioned

The question was posed to me during an online interview.

This question is from Inference in First-Order Logic in section Knowledge and Reasoning of Artificial Intelligence

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The correct option is (a) Crown(John) ^ OnHead(John, Jonny)

For explanation I would say: None.

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