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Which of the following relates to Chomsky hierarchy?

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Which of the following relates to Chomsky hierarchy?

(a) Regular<CFL<CSL<Unrestricted

(b) CFL<CSL<Unrestricted<Regular

(c) CSL<Unrestricted<CF<Regular

(d) None of the mentioned

This question was addressed to me in final exam.

I would like to ask this question from Regular Languages and D-PDA in section Push Down Automata of Automata Theory

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Correct choice is (a) Regular<CFL<CSL<Unrestricted

To elaborate: The chomsky hierarchy lays down the following order: Regular<CFL<CSL<Unrestricted

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