A beam is subjected to couples as shown in figure. The maximum shear force and bending moment in the beam respectively are 20 KN 2 m 1 m 20 KN ** 2 m * 20 kN 2 m 20 KN 1 m (a) 20 kN, 20 kN-m (b) 10 kN, 20 kN-m N (c) 0 kN, 20 kN-m (d) 20 kN, 10 kN-m