If n and \( l \) are principal and azimuthal quantum numbers respectively, the expression for ...

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If n and \( l \) are principal and azimuthal quantum numbers respectively, the expression for calculating the total number of electrons in any shell is
\( \mathrm{P} \)
(A) \( \sum_{l=0}^{l=\mathrm{n}} 2(2 l+1) \)
(B) \( \sum_{l=1}^{l=(\mathrm{n}-1)} 2(2 l+1) \)
(C) \( \sum_{l=0}^{l=(\mathrm{n}+1)} 2(2 l+1) \)
(D) \( \sum_{l=0}^{l=(n-1)} 2(2 l+1) \)
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