Which one of the following sets of ions represents the collection of isoelectronic species?

Question

$K^+, Cl^-, Mg^{2+}, Sc^{3+}$

$Na^+, Ca^{2+}, Sc^{3+}, F^-$

$K^+, Ca^{2+}, Sc^{3+}, Cl^-$

$Na^+, Mg^{2+}, Al^{3+}, Cl^-$

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