Which of the following are context free grammars?
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Extracted text: O G=({S, A, B}, {a,b, (,+,)}, S, P) S→ aBA | aSa | A A → aAa | b(b+a) B → BS | a O G={{S,A,B},{a,b.c),S,P) S Sac | AbB | Bсс B→BC | aa | b B→BA | bb
Extracted text: Which of the following are context-free grammars? O G={(S,A,B},{a,b,C},S,P) S→ as | AAb | Ba A - Bb | ac B - BB | a O G=({S,A,C},{c,d,e},S,P) S- Ac | Bd A + CA| ee В — сВс | ed O G=({S,A,B},{a,b},S,P) S- AbbA | Sa | Ba A→ aAb | ab b → Aa | b O G=({S},{a,b.c},S,P) S→ aSb | SA| ca A- bba O G=({S,A},{a,b},S,P) S→ aSa | bAa | b AA→ aAa | bb