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Counter-Strike: Source (2004)

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The following given table represents a part of the periodic table.
\begin{tabular}{|l|l|l|c|c|c|c|c|c|c|}
\hline \( \begin{array}{l}\text { Groups } \rightarrow \\
\text { Periods } \downarrow\end{array} \) & 1 & 2 & \( \begin{array}{c}3 \\
\text { to } \\
12\end{array} \) & 13 & 14 & 15 & 16 & 17 & 18 \\
\hline 2 & & & & & & & Q & & R \\
\hline 3 & & \( \mathrm{P} \) & & & & T & & & \( \mathrm{U} \) \\
\hline
\end{tabular}
\( \mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{T} \) and \( \mathrm{U} \) are respectively
a. \( \mathrm{Mg}, \mathrm{S}, \mathrm{Ar}, \mathrm{Al} \), and \( \mathrm{Ne} \)
b. \( \mathrm{O}, \mathrm{Mg}, \mathrm{Ar}, \mathrm{P} \) and \( \mathrm{Ne} \)
c. \( \mathrm{Mg}, \mathrm{O}, \mathrm{Ne}, \mathrm{P} \) and \( \mathrm{Ar} \)
d. S, Mg, Al, Ar, Ne
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