Two identical capacitors, have the same capacitance C. One of them is charged to potential `V_1` and the other to `V_2`. Likely charged plates are then connected. Then the decrease in energy of the combined system is
Options:
(a) `1/4C(V_1^2-V_2^2)`
(b) `1/4C(V_1^2+V_2^2)`
(c) `1/4C(V_1-V_2)`
(d) `1/4C(V_1+V_2)`