The cyanide process of gold extraction involves leaching out gold from its ore with $$CN^{-}$$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s)

A

Q is $$O_2$$

B

T is Zn

C

Z is $$[Zn(CN)_4]^{2-}$$

D

R is $$[Au(CN)_4]^-$$