A circular column is subjected to an un-factored load of 1600 kN. The effective length of the column is 3.5 m, the concrete is M 25, and the value of \({\rho _g} = \frac{{{A_{SC}}}}{{{A_g}}} = 2\%\) for Fe 415 steel. The design diameter of the column will be nearly
1
446 mm
2
432 mm
3
424 mm
4
410 mm