Consider the following statements:

The theory of simple bending assumes that

the material of the beam is homogenous, isotropic and obeys Hook's law

plane sections of the beam remain plane after bending

Each cross section of the beam is symmetric about the loading plane

Young's moduli are the same for tension and compression

- 1
  
  $1$ and $2$ are correct
- 2
  
  $1, 3$ and $4$ are correct
- 3
  
  $2, 3$ and $4$ are correct
- 4
  
  $1, 2, 3$ and $4$ are correct

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