The $20^{th}$ electron of $Fe$ $(Z = 26)$ has which of the following sets of quantum numbers?

  • A
    $3, 2, -2, -\frac{1}{2}$
  • B
    $3, 2, 0, +\frac{1}{2}$
  • C
    $4, 0, 0, +\frac{1}{2}$
  • D
    $4, 1, -1, +\frac{1}{2}$

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For the given quantum numbers $n$ and $l$ of electrons:
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