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Which among the following are semi decidable?

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Which among the following are semi decidable?

(a) Empty-DFA

(b) Rec-NFA

(c) Infinite-DFA

(d) All of the mentioned

I got this question in an internship interview.

I would like to ask this question from The Universal Language-Undecidability topic in chapter Undecidability of Automata Theory

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Correct answer is (d) All of the mentioned

Explanation: Explanation: All are the properties of regular languages and all are decidable languages.

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