$Cu^{2+}$ and $Cd^{2+}$ are distinguished through the formation of complexes $[Cu(CN)_4]^{3-}$ and $[Cd(CN)_4]^{2-}$ when $H_2S$ gas is passed. Which of the following is correct?
- AThere is a yellow precipitate due to $CdS$.
- BThere is a black precipitate due to $CuS$.
- CThere is a blue precipitate due to $CuS$.
- DThere is a precipitation of $CuS$ and $CdS$ together.
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