the maximum value of bending moment that can be applied to be shaft is

Question

A circular shaft can transmit a torque of 5 kNm. If the torque is reduced to 4 kNm, then the maximum value of bending moment that can be applied to be shaft is

         (a) 1 kN-m                      (b) 2 kN-m

         (c) 3 kN-m                      (d) 4 kN-m