Strength of Materials Shear Stress and Bending Stress

Which of the following statement is CORRECT related to assumptions in the theory of simple bending?

1
 The value of Young’s modulus of elasticity in tension and compression is different.
2
The stress in beam material may exceed the elastic limit.
3
The Poisson’s effect and the interference of the adjoining differently fibres (of beam material) are ignored.
4
The curvature of the axis of beam in bending is directly proportional to flexural rigidity. 

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