Which of the following pairs of ions are isoelectronic and isostructural ?

Question

$\begin{array}{1 1} CO^{2-} _{3-} ,NO_3^{-} \\ CIO^{-} _{3},CO^{2-}_3 \\ SO_3^{2-},NO^{-}_3 \\ ClO^{-}_3,SO^{2-}_3 \end{array} $