If $M_{d}$ and $M_{l}$ are the maximum bending moments due to dead load and live load respectively and F is the total effective pressure, for a balanced design of a prestressed concrete beam of steel, is

- 1
  
  $e = \frac{M_{d}}{F} + \frac{M_{l}}{2 F}$
- 2
  
  $e = \frac{M_{d}}{2 F} + \frac{M_{l}}{F}$
- 3
  
  $e = \frac{M_{d}}{2 F} + \frac{M_{l}}{3 F}$
- 4
  
  $e = \frac{M_{l}}{3 F} + \frac{M_{l}}{2 F}$

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