Identify the isoelectronic species from the following groups.

  • A
    $Be, Al^{3+}, Cl$
  • B
    $Co^{2+}, Cs^{+}, Br$
  • C
    $N^{3-}, F^{-}, Na^{+}$
  • D
    $Na^{+}, Co^{2+}, Mg^{2+}$

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