Question: which is true? 1 Pumping lemma for context free languages may be used to prove that certain languages are not context free. 2 There exist

which is true?
1Pumping lemma for context free languages may be used to prove that certain languages are not context free.
2There exist different variations of Turing Machines definitions which are not equivalent.
3All languages are Turing recognizable.
4A language is a set of strings.

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