Question: Which statements below on computational complexity theory foundations are true 1 There exist questions about context - free languages that are not decidable. 2 Pumping

Which statements below on computational complexity theory foundations are true
1There exist questions about context-free languages that are not decidable.
2Pumping lemma for regular languages cannot be used to prove that certain languages are not regular.
3There are no languages which would not be Turing recognizable.
4Regular languages form a subset of context-free languages.

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