The spine! structure $\left({\mathrm{AB}}_2{\mathrm{O}}_4\right)$ consists of an fee array of ${\mathrm{O}}^{2-}$ ions in which the :

A cation occupies one-eighth of the octahedral hole and the B cations the tetrahedral holes

A cation occupies one-fourth of the octahedral holes and B cations the tetrahedral holes

A cation occupies one-fourth of the tetrahedral holes and the B cations the octahedral holes

A cation occupies one-eighth of the tetrahedral holes and B cation occupies one-half of octahedral hole