Which of the following is/are connect process for the separation of given ions ?
A. `Cu^(2+)` from the mixture of `Cu^(2+)`and `Cd^(2+)` in aqueous solution
`Cu^(2+)+ Cd^(2+) overset("Add excess") underset(KCN) to overset("Pass"H_(2)S) underset("and filter") to Cu^(2+)` in the filtrate
B. `Cu^(2+)` from the mixture of `Cu^(2+)`and `Cd^(2+)` in aqueous solution
`Cu^(2+)+ Cd^(2+) overset("Add excess") underset(KCN) to overset("Pass" H_(2)S) underset("and filter") to Cu^(2+)` in the precipitate
C. `Zn^(2+)` from the mixture of `Zn^(2+)`and `Cu^(2+)` in aqueous solution
`Zn^(2+)+ Cu^(2+) overset(H_(2)S+dil HCI) to overset("Filter") to Zn^(2+)` in the precipitate
D. `Fe^(3+)` from the mixture of `Fe^(2+)`and `Fe^(2+)` in aqueous solution
`Fe^(2+)+ Fe^(3+) overset(NH_(4)CI +NH_(3))overset("solution and filter")rarr Fe^(2+)` in the precipitate
