The correct order of radii is [IIT-JEE (Screening) 2000]

• A. \[N<Be<B\]
• B. \[{{F}^{-}}<{{O}^{2-}}<{{N}^{3-}}\]
• C. \[Na<Li<K\]
• D. \[F{{e}^{3+}}<F{{e}^{2+}}<F{{e}^{4+}}\]