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