Which of the following is/are the redox reactions?

A. O2 + 2H2 → 2H2O

B. Na + H2O → NaOH +1/2H2

C. MnCl3 → MnCl2 + 1/2Cl2

1
A only
2
B and C
3
C only
4
A, B and C

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