For the Fourier series of the following function of period 2π \(f\left( x \right) = \left\{ {\begin{array}{*{20}{c}} {0,}&{ - \pi < x < 0}\\ {1,}&{0 < x < \pi } \end{array}} \right.\) the ratio (to the nearest integer) of the Fourier coefficients of the first and the third harmonic is:
1
1
2
2
3
3
4
6