The Source of nitrogen in Gabrial synthesis amines is _____________

Question

$\begin{array}{1 1} \text{Sodium axide, NaN_3} \\ \text{Sodium nitrite ,NaNO_3} \\ \text{Potassium cyanide ,KCN} \\ \text{Potossium phthalimide,} C_6H_4(CO)_2N^{-}K^{+} \end{array} $