Benzene diazonium chloride reacts with $\mathrm{KI}$ to form:

What is the major product of the following reaction?

${\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{NH}}_2\underset{\mathrm{HCl}, 0 °\mathrm{C}}{\overset{{\mathrm{NaNO}}_2}{\to }} \stackrel{\mathrm{CuCN}}{\to }$.