Which of the following reactions are disproportionation reaction? (a) 2Cu+ -> Cu 2+ + Cu 0 (b) 3MnO4 2- + 4H+ -> 2MnO4 - + MnO2 + 2H2O (c) 2KMnO4 K2MnO4 + MnO2 + O2 (d) 2MnO4 - + 3Mn 2+ + 2H2O -> 5MnO2 + 4H+ Select the correct option from the following

1. A. (a) and (d) only
2. B. (a) and (b) only
3. C. (a), (b) and (c)
4. D. (a), (c) and (d)

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