If L1 and L2 are context free language and R a regular set, then which one of the languages below is not necessarily a context free language?

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Q. If L1 and L2 are context free language and R a regular set, then which one of the languages below is not necessarily a context free language?

(A) L1 L2
(B) L1 ∩ L2
(C) L1 ∩ R
(D) L1 ∪ L2

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✅ Correct Answer: (B) L1 ∩ L2

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