A machine of mass 100 kg is subjected to an external harmonic force with a frequency of 40 rad/s. The designer decides to mount the machine on an isolator to reduce the force transmitted to the foundation. The isolator can be considered as a combination of stiffness (\(K\)) and damper (damping factor, \(\xi\)) in parallel. The designer has the following four isolators:
1) \(K = 640 \, \text{kN/m}, \, \xi = 0.70\)
2) \(K = 640 \, \text{kN/m}, \, \xi = 0.07\)
3) \(K = 22.5 \, \text{kN/m}, \, \xi = 0.70\)
4) \(K = 22.5 \, \text{kN/m}, \, \xi = 0.07\)
Arrange the isolators in the ascending order of the force transmitted to the foundation.