Pick up the correct statement from the following:

• The bending moment which when acting alone would produce the maximum stress equal to the major principal stress caused by combined bending and torsion, is called equivalent bending moment
• Mcg = (M M2 + r2) where letters carry their usual meanings
• Tcp = m2 + T2 where letters carry their usual meanings
• The torque which when acting alone would produce maximum shear stress equal to the maximum shear stress caused by the combined bending and torsion, is called equivalent torque
• All the above.