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+)`