Which can be converted to inferred equivalent CNF (Conjunction Normal Form) sentence?

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Question:

Which can be converted to inferred equivalent CNF (Conjunction Normal Form) sentence?

A.

every sentence of propositional logic

B.

every sentence of inference

C.

every sentence of first-order logic

D.

all of the mentioned

Answer» c. every sentence of first-order logic

Note: The above multiple-choice question is for all general and Competitive Exams in India.