What respectively are the equivalent bending moment and equivalent torque?

Question

A member is subjected to the combined action of bending moment 400 Nm and torque 300 Nm. What respectively are the equivalent bending moment and equivalent torque?                                      

(a) 450 N- m and 500 N - m

(b) 900 N- m and 350 N - m

(c) 900 N- m and 500 N - m

(d) 400 N -m and 500 N - m