The binding energy of ${}_{\text{1}}{\text{H}}^{\text{2}}\text{,}{}_{\text{2}}{\text{He}}^{\text{4}}\text{,}{}_{\text{26}}{\text{Fe}}^{\text{56}}$ and ${}_{\text{92}}{\text{U}}^{\text{235}}$ nuclei are 2.22, 28.3, 492, 1786 MeV respectively, which one of the following is the most stable nucleus ?