A shafts subjected to fluctuating loads for which then normal torque (T) and bending moment (M) are 100 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting
(a) 2000 N-m (b) 2050 N-m
(c) 2100 N-m (d) 2136 N-m