Out of ' \( \mathrm{X} \) ' pairs of ribs in humans only ' \( \mathrm{Y} \) ' pairs are true ribs.
P Select the option thạt correctly represents values of \( \mathrm{X} \) and \( \mathrm{Y} \)
D. and provides their explanation:
(2017-Delhi)
\begin{tabular}{|c|c|l|}
\hline a. & \( \begin{array}{c}\mathrm{X}=12, \\
\mathrm{Y}=7\end{array} \) & \( \begin{array}{l}\text { True ribs are attached dorsally to vertebral } \\
\text { column and ventrally to the sternum }\end{array} \) \\
\hline b. & \( \begin{array}{c}\mathrm{X}=12, \\
\mathrm{Y}=5\end{array} \) & \( \begin{array}{l}\text { True ribs are attached dorsally to vertebral } \\
\text { column and sternum on the two ends }\end{array} \) \\
\hline c. & \( \begin{array}{c}\mathrm{X}=24, \\
\mathrm{Y}=7\end{array} \) & \( \begin{array}{l}\text { True ribs are dorsally attached to vertebral } \\
\text { column but are free on ventral side }\end{array} \) \\
\hline d. & \( \begin{array}{r}\mathrm{X}=24, \\
\mathrm{Y}=12\end{array} \) & \( \begin{array}{l}\text { True ribs are dorsally attached to vertebral } \\
\text { column but are free on ventral side }\end{array} \) \\
\hline
\end{tabular}
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