Match the compound in Column I with the statement in Column II. Column I: P $\mathrm{Li}{}_2\mathrm{CO}{}_3$, Q $\mathrm{NaHCO}{}_3$, R $\mathrm{Ca}(\mathrm{HCO}{}_3){}_2$, S $(\mathrm{NH}{}_4){}_2\mathrm{CO}{}_3$. Column II: 1 on heating leaves only a metal oxide and releases $\mathrm{CO}{}_2$; 2 a stable solid whose heating leaves a normal carbonate; 3 on heating leaves no residue; 4 known only in solution.

1. AP-2, Q-1, R-4, S-3
2. BP-1, Q-2, R-3, S-4
3. CP-3, Q-2, R-4, S-1
4. DP-1, Q-2, R-4, S-3