Sum of \( n \) terms of the series \( \sqrt{2}+\sqrt{8}+\sqrt{18}+\...

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Sum of \( n \) terms of the series \( \sqrt{2}+\sqrt{8}+\sqrt{18}+\sqrt{32}+\cdots \) is
(a) \( \frac{n(n+1)}{2} \)
(b) \( 2 n(n+1) \)
(c) \( \frac{n(n+1)}{\sqrt{2}} \)
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