Arrange the following in increasing order of ionic radii: $O^{2-}, Na^{+}, F^{-}, Mg^{2+}$
- A$Mg^{2+} < Na^{+} < F^{-} < O^{2-}$
- B$Mg^{2+} < F^{-} < Na^{+} < O^{2-}$
- C$O^{2-} < F^{-} < Na^{+} < Mg^{2+}$
- D$O^{2-} < Mg^{2+} < F^{-} < Na^{+}$
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