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Which of the following belong to the steps to prove emptiness?

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in Automata Theory by (51.1k points)
Which of the following belong to the steps to prove emptiness?

(a) Remove useless variable

(b) Check if a start variable S is useless

(c) Both (a) and (b)

(d) None of the mentioned

The question was posed to me in class test.

My enquiry is from Intersection with Regular Languages in section Properties of Context Free Languages of Automata Theory

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Correct option is (c) Both (a) and (b)

Explanation: The empty-language question can be stated as: For context free grammar G find if L(G) =f?

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