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Which of the following is not a negative property of Context free languages?

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Which of the following is not a negative property of Context free languages?

(a) Intersection

(b) Complement

(c) Both (a) and (b)

(d) None of the mentioned

I had been asked this question in an interview for job.

Origin of the question is Intersection with Regular Languages topic in division Properties of Context Free Languages of Automata Theory

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The correct answer is (c) Both (a) and (b)

To explain: Context free languages are not closed under complement and intersection. Thus, are called Negative properties.

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