Which of the following aqueous solutions of salts is neutral?

$\text{NH}_4\text{NO}_3$ is a salt of a weak base ($\text{NH}_4\text{OH}$) and a strong acid ($\text{HNO}_3$). Its aqueous solution is acidic.

$\text{KCN}$ is a salt of a strong base ($\text{KOH}$) and a weak acid ($\text{HCN}$). Its aqueous solution is basic.

$\text{KNO}_3$ is a salt of a strong base ($\text{KOH}$) and a strong acid ($\text{HNO}_3$). Its aqueous solution is neutral.

$\text{CuCl}_2$ is a salt of a weak base ($\text{Cu(OH)}_2$) and a strong acid ($\text{HCl}$). Its aqueous solution is acidic.

Answer: $\text{KNO}_3$