The $2-$mm$-$thick bar shown in Fig. is loaded axially with a constant force of $10$ kN$.$ The bar material has been heat treated and quenched to raise its strength, but as a consequence it has lost most of its ductility. It is desired to drill a hole through the center of the $40-$mm face of the plate to allow a cable to pass through it$.$ A $4-$mm hole is sufficient for the cable to fit, but an $8-$mm drill is readily available. Will a crack be more likely to initiate at the larger hole, the smaller hole, or at the fillet? $\frac{?}{{?}_{?}}$