If the loading on a simply supported pre-stressed concrete beam is uniformly distributed, the centrioid of tendons should be preferably

- 1
  
  a straight profile along the centroidal axis
- 2
  
  a straight profile along with the lower kem
- 3
  
  a parabolic profile with convexity upward
- 4
  
  a circular profile with conviexity upward

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