Which one of the following reactions occurs at the anode on electrolysis of aq., solution of `CuCl_(2)` ?
A. `Cu to Cu^(2+) + 2 e^(-)`
B. `2 Cl^(-) to Cl_(2) + 2e^(-)`
C. `2 H_(2)O to O_(2) + 4 H^(+) + 4 e^(-)`
D. `4 Cl^(-) + 2 H_(2)O to 4 HCl + O_(2) + 4 e^(-)`
