In the complex $\left[\mathrm{Pt}{\left(\mathrm{py}\right)}_4\right]\left[{\mathrm{PtCl}}_4\right]$, the oxidation numbers of Pt atom in former and latter part of the compound are respectively 

• A

  0 and 0

• B

  +4 and +2

• C

  +2 and +2

• D

  0 and +4