Consider the table given:

$\begin{array}{|cl|cI|cI|}\hline &\textbf{Constructional feature} & \textbf{Machine type} & \textbf{Mitigation} \\ \hline &\text{P. Damper bars} & \text{S. Induction motor} & \text{X. Hunting} \\ \hline &\text{Q. Skewed rotor slots} & \text{T. Transformer} & \text{Y. Magnetic locking} \\ \hline &\text{R. Compensating winding} & \text{U. Synchronous machine} & \text{Z. Armature reaction} \\ \hline &\text{} & \text{V. DC machine} & \text{} \\ \hline \end{array}$

The correct combination that relates the constructional feature, machine type and mitigation is

1. $\text{P-V-X, Q-U-Z, R-T-Y}$
2. $\text{P-U-X, Q-S-Y, R-V-Z}$
3. $\text{P-T-Y, Q-V-Z, R-S-X}$
4. $\text{P-U-X, Q-V-Y, R-T-Z}$
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