When a metal rod M is dipped into an aqueous colourless concetrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous `NH_3` dissolves O and gives an intense blue solution. Q. The final solution contains.
A
`[Pb(NO_(3))_(4)]^(2+)` and `[CoCl_(4)]^(2-)`
B
`[Al(NH_(3))_(2)]^(3+)` and `[Cu(NH_(3))_(4)]^(2+)`
C
`[Al(NH_(3))_(2)]^(+)` and `[Cu(NH_(3))_(4)]^(2+)`
D
`[Al(NH_(3))_(2)]^(+)` and `[Ni(NH_(3))_(6)]^(2+)`
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