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Which of the following is not a notion of Context free grammars?

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in Automata Theory by (51.1k points)
Which of the following is not a notion of Context free grammars?

(a) Recursive Inference

(b) Derivations

(c) Sentential forms

(d) All of the mentioned

The question was asked during an interview.

My query is from The Language of a Grammar, Inferences and Ambiguity topic in portion Context Free Grammars and Languages of Automata Theory

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Correct option is (d) All of the mentioned

The best I can explain: The following are the notions to express Context free grammars:

a) Recursive Inferences

b) Derivations

c) Sentential form

d) Parse trees

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