What is the electron configuration for the transition metal ion(s)

What is the electron configuration for the transition metal ion(s) in each of the following compounds?
a. (NF4)2[Fe(h2O)2CI4]
b. [Co(NH3)2(NH2CH2CH2NH2)2]I2
c. Na2[TaF7]
d. [Pt(NH3)4I2][Ptl4]
Pt forms +2 and +4 oxidation states in compounds.