In the process of extraction of gold.
Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2))rarr [X]+OH^(-)`
`[X]+Znrarr [Y]+Au`
Identify the complexes `[X] ` and `[Y]`.
A. `[X]=[Au(CN)_(2)]^(-),[Y] =[Zn (CN_(4))]^(-2)`
B. `[X]=[Au(CN)_(4)]^(-3),[Y] =[Zn (CN_(4))]^(-2)`
C. `[X]=[Au(CN)_(2)]^(-3),[Y] =[Zn (CN_(6))]^(-4)`
D. `[X]=[Au(CN)_(4)]^(-),[Y] =[Zn (CN_(4))]^(-2)`