Consider the following statements: I. On a principal plane,

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Consider the following statements:
I. On a principal plane, only normal stress acts.
II. On a principal plane, both normal and shear stresses act.
III. On a principal plane, only shear stress acts.
IV. Isotropic state of stress is independent of frame of reference.
The TRUE statement(s) is/are

1. I and IV
2. II
3. II and IV
4. II and III

Correct Option: A

I and IV