Among the structures given below which one represents nitrolic acid?

$\mathrm{R}-\mathrm{CN}\underset{(\mathrm{Complete} \mathrm{hydrolysis})}{\overset{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }}\mathrm{X}\underset{∆}{\overset{{\mathrm{NH}}_3}{\to }}\mathrm{Y}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) {\mathrm{Br}}_2+\mathrm{KOH}}{\to }}\mathrm{Z}$ Identify $\mathrm{Z}$.

The correct increasing order of basic strength of the following compounds is: