Aqueous `ZnSO_(4)` treated with `Na_(2)CO_(3)//H_(2)O` produces A which when heated forms B which further treated with cobalt nitrate and warmed C is formed. A,B and C are respectively.
A. `ZnCO_(3), Zn` and `CoO`
B. `ZnO,Zn` and `CoZnO_(2)`
C. `ZnCO_(3).3Zn(OH)_(2),ZnO` and `CoZnO_(2) ` respectively
D. `ZnCO_(3), ZnO,CoO`
