A unit gain 2$^{nd}$ order underdamped process has a period of oscillation 1 second and decay ratio 0.25. The transfer function of the process is

1. $\frac{1}{0.024s^2 + 0.067s+1}$
2. $\frac{1}{0.067s^2 + 0.024s+1}$
3. $\frac{1}{0.021s^2 + 0.1176s+1}$
4. $\frac{1}{0.1176s^2 + 0.021s+1}$