Which of the following statements is true?

GATE · 2001 · CS · Question 1 subparts

1. A.

   If a language is context free it can always be accepted by a deterministic push-down automaton

2. B.

   The union of two context free languages is context free

3. C.

   The intersection of two context free languages is context free

4. D.

   The complement of a context free language is context free

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