If permissible compressive stress in concrete is 50 kg/cm$$^2$$, tensile stress in steel is 1400 kg/cm$$^2$$ and modular ratio is 18, the depth of the beam is

1] $$d = \sqrt{\frac{0.11765 \times B.M}{breadth}}$$

2] $$d = \sqrt{\frac{0.22765 \times B.M}{breadth}}$$

3] $$d = \sqrt{\frac{0.33765 \times B.M}{breadth}}$$

4] $$d = \sqrt{\frac{0.44765 \times B.M}{breadth}}$$

A

[1] only

B

[2] only

C

[3] only

D

[4] only