A steel bar of cross section 40 mm 40 mm and 2500 mm long is subjected to an axial pull of 130 kN. If the modulus of elasticity is 2 x 105 N/mm and Poisson's ratio is 0.35, the alterations in the length and sides of the bar during the extension are, respectively (a) + 1.015 mm, - 0.00568 mm (b) - 1.015 mm, 0.00568 mm (c) 1.015 mm, 0.00568 mm (d) - 1.015 mm, + 0.00568 mm