Please answer and explain the movement of electrons in the following mechanism and provide the overall reaction at the bottom.
Mechanism: 
 Cl2 + 2OH- → ClO- + Cl- + H2O
 ClO- + Cl- + H2O2 → Cl2 + OH- + H2O
Overall Reaction:
 a. Cl2 + 2OH- → ClO- + Cl- + H2O
 b. ClO- + Cl- + H2O2 → Cl2 + OH- + H2O
 c. Cl2 + 2OH- + ClO- + Cl- + H2O2 → 2Cl- + 2H2O + ClO2
 d. Cl2 + 2OH- + H2O2 → 2Cl- + 2H2O