Refer the following statement and answer the question. 'Name of " \( \mathrm{X} \) " is derived ...

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Refer the following statement and answer the question.
'Name of " \( \mathrm{X} \) " is derived from stinging capsules. It exhibits metagenesis containing two body forms in which sessile and cylindrical form is called " \( Y \) ", and umbrella shaped and free swimming is called " \( Z \) ".
Identify \( \mathrm{X}, \mathrm{Y} \), and \( \mathrm{Z} \).
\begin{tabular}{|l|l|l|l|}
\hline & \multicolumn{1}{|c|}{\( \mathrm{X} \)} & \multicolumn{1}{c|}{\( \mathrm{Y} \)} & \multicolumn{1}{c|}{\( \mathrm{C} \)} \\
\hline a. & Coelenterate & Polyp & \multicolumn{1}{c|}{ Medusa } \\
b. & Cnidarian & Medusa & Polyp \\
c. & Ctenophora & Radula & Hypostome \\
d. & Porifera & Osculum & Radula \\
\hline
\end{tabular}
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