A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis $n_{1}$ . If $f_{c}$ and $f_{t}$ are permissible compressive and tensile stresses, the moment to resistance of the beam, is

- 1
  
  $b n \frac{f_{c}}{2} (d - \frac{n}{3})$
- 2
  
  $A t f_{t} (d - \frac{n}{3})$
- 3
  
  $\frac{1}{2} n_{1} (1 - \frac{n_{1}}{3}) c b d^{2}$
- 4
  
  all the above

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