The identity element with respect to the multiplication shown in the table below.

\begin{tabular}{|l|l|l|l|l|}
\hline\(*\) & \(\mathrm{X}\) & \(\mathrm{Y}\) & \(\mathrm{Z}\) & \(\mathrm{W}\) \\
\hline \(\mathrm{X}\) & \(\mathrm{W}\) & \(\mathrm{Z}\) & \(\mathrm{X}\) & \(\mathrm{W}\) \\
\hline \(\mathrm{Y}\) & \(\mathrm{Z}\) & \(\mathrm{W}\) & \(\mathrm{Y}\) & \(\mathrm{X}\) \\
\hline \(\mathrm{Z}\) & \(\mathrm{X}\) & \(\mathrm{Y}\) & \(\mathrm{Z}\) & \(\mathrm{W}\) \\
\hline \(\mathrm{W}\) & \(\mathrm{X}\) & \(\mathrm{Y}\) & \(\mathrm{W}\) & \(\mathrm{Z}\) \\
\hline
\end{tabular}

A. Y
B. X
C. W
D. Z  

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Correct Answer: D