`Co^(2+)(aq.)+SCN^(-)(aq.)to"Complex"(X)` `Ni^(2+)(aq.)+"Dimethylglyoxime"overset(NH_4OH)to"Complex"(Y)`. The coordination number of cobalt and nickel

`Co^(2+)(aq.)+SCN^(-)(aq.)to"Complex"(X)`
`Ni^(2+)(aq.)+"Dimethylglyoxime"overset(NH_4OH)to"Complex"(Y)`.
The coordination number of cobalt and nickel in complexes X and Y is four.
The IUPAC name of the complexes (X) and (Y) are respectively:
A. Tetrathiocyanato-S-cobalt(II) and Bis(dimethylglyoximate) nickel(II)
B. Tetrathiocyanato-S-cobaltate(II) and Bis(dimethylglyoximate) nickel(II)
C. Tetrathiocyanato-S-cobalt(II) and Bis(dimethylglyoximate) nickelate(II)
D. Tetrathiocyanato-S-cobalt(III) and Bis(dimethylglyoximate) nickel(II)