A system under biaxial loading induces principal stresses of 100 N/cm2 tensile and 50 N/cm2 compressive at a point. The normal stress at that point on the maximum shear stress plane is
A. 75 N/cm2 tensile

B. 50 N/cm2 compressive

C. 100 N/cm2 tensile

D. 25 N/cm2 tensile