Durinh electrlysis of an aqueous solution of `CuSO_(4)` using copper electrodes, if `2.5g` of `Cu` is deposited at cathode, tehn at anode
A. `890 mL` of `CI_(2)` at `STP` is liberated
B. `445mL` of `O_(2)` at `STP` is liberated
C. `2.5g` of copper is deposited
D. a decreases of `2.5g` of mass takes place