Pick the incorrect statement from the following four statements:

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Pick the incorrect statement from the following four statements:

1. On the plane which carries maximum normal stress, the shear stress is zero.
2. Principal planes are mutually orthogonal
3. On the plane which carries maximum shear stress, the normal stress is zero.
4. The principal stress axes and principal strain axes coincide for an isotropic material.

Correct Option: C

Actually, on a plane which carries maximum shear stress the normal stress exist.