In that below diagram $C_1= 4 \mu F, C_2 =12 \mu F, C_3=8 \mu F$ Energy consumed in charging these capacitors is :

Question

 

$(A)\;22 \times 10^{-6} J \\ (B)\;88 \times 10^{-6} J \\ (C)\; \frac{64}{3} \times 10^{-6} J\\ (D)\;\frac{32}{3} \times 10^{-6} J$