If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the disign of the span of a square flat slab, should not be less than

- 1
  
  $\frac{W L}{12} {(L - \frac{2 D}{3})}^{2}$
- 2
  
  $\frac{W L}{10} {(L + \frac{2 D}{3})}^{2}$
- 3
  
  $\frac{W L}{10} {(L - \frac{2 D}{3})}^{2}$
- 4
  
  $\frac{W L}{12} {(L - \frac{D}{3})}^{2}$

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