What is the change in oxidation number o...

What is the change in oxidation number of chlorine in the following reaction? `2H_2O_2 +ClO_4^(-)rarr2O_2+ClO_2^(-)+2H_2O`

A

+4 to +3

B

+7 to +3

C

+3 to +1

D

+6 to +3

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