On treatment of 100 mL of 0.1 M solution of `COCl_(3).6H_(2)O` with excess of `AgNO_(3), 1.2 xx 10^(22)` ions are precipitated. The complex is
A. `[Co(H_(2)O)_(4) Cl_(2)]Cl. 2H_(2)O`
B. `[Co(H_(2)O)_(3)]. 3H_(2) O`
C. `[Co(H_(2)O)_(6)] Cl_(3)`
D. `[Co(H_(2)O)_(5) Cl]Cl_(2). H_(2)O`