When a metal rod $\mathbf{M}$ is dipped into an aqueous colourless concentrated solution of compound $\mathbf{N}$, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate $\mathbf{O}$. Addition of aqueous $\mathrm{NH}_3$ dissolves $\mathbf{O}$ and gives an intense blue solution.
The final solution contains
Select the correct option:
A
$\left[\mathrm{Pb}\left(\mathrm{NH}_3\right)_4\right]^{2+}$ and $\left[\mathrm{CoCl}_4\right]^{2-}$
B
$\left[\mathrm{Al}\left(\mathrm{NH}_3\right)_4\right]^{3+}$ and $\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$
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