A \( \frac{1}{3} n(2 n+2)(2 n+1) \)
B \( \frac{1}{3} n(n+1)(2 n+1) \)
C \( \frac{2}{3} \mathrm{n}(\mathrm{n}+1)(2 \mathrm{n}+1) \)
D \( \frac{3}{2} n(n+1)(2 n+1) \)
Correct Answer: Option C
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