How many emission spectral lines are possible when a hydrogen atom is excited to the $n$th energy level?

  • A
    $\frac{n(n+1)}{2}$
  • B
    $\frac{(n+1)}{2}$
  • C
    $\frac{n(n-1)}{2}$
  • D
    $\frac{n^2}{4}$

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