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

(a) CO32-: 6+24+2=32;sp2; trigonal planar          NO3-: 7+24+1=32;sp2; trigonal planar These are  isoelectronic as well as isostructural. (b) ClO3-:17+24+1=42;sp3, trigonal pyramidal           CO32-: 6+24+2=32;sp2, trigonal planar  These are neither isoelectronic nor isostructural  (c) SO32-:16+24+2=42;sp3, trigonal pyramidal           NO3-: 7+24+1=32;sp2, trigonal planar           These are neither isoelectronic nor isostructural  (d) ClO3-:17+24+1=42;sp3 , trigonal pyramidal   SO32-:16+24+2=42;sp3, trigonal pyramidal These are also isoelectronic as well as isostructural.NOTE : first and fourth options  are correct