451. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
[A]. 400 MPa
[B]. 500 MPa
[C]. 900 MPa
[D]. 1400 MPa
✅ The correct answer is option D.