The formula of the complex diamminechloro-(ethylenediamine) nitroplatinum (IV) chloride is
A. `[Pt(NH_(3))_(2)Cl(en)NO_(2)]Cl_(2)`
B. `Pt[Pt(NH_(3))_(2)(en) Cl_(2)NO_(2)]`
C. `Pt[(NH_(3))_(2) (en) NO_(2) ] Cl_(2)`
D. `Pt[(NH_(3))_(2) (en) NO_(2)Cl_(2)]`