The equivalent bending momentfor a shaft which is subjected to the combined twisting moment (T) and bending moment(M)is given by equation

A

$$\frac{1}{2}\left[\sqrt{M^{2}+T^{2}}\right]$$

B

$$\left[\sqrt{M^{2}+T^{2}}\right]$$

C

$$\frac{1}{2}\left[M+\sqrt{M^{2}+T^{2}}\right]$$

D

$$\left[M+\sqrt{M^{2}+T^{2}}\right]$$