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To which of the following class does a CNF-satisfiability problem belong?

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To which of the following class does a CNF-satisfiability problem belong?

(a) NP class

(b) P class

(c) NP complete

(d) NP hard

I have been asked this question in an internship interview.

Question is taken from Checksum, Complexity Classes & NP Complete Problems topic in portion Checksum, Complexity Classes & NP Complete Problems of Data Structures & Algorithms II

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Best answer
Correct choice is (c) NP complete

The best explanation: The CNF satisfiability problem belongs to NP complete class. It deals with Boolean expressions.

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