The sum of electrons present in all subshells of an atom with $m_s$ value of $+\frac{1}{2}$ for $n=4$ and $m_s$ value of $-\frac{1}{2}$ for $n=3$ is

  • A
    $25$
  • B
    $16$
  • C
    $09$
  • D
    $32$

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