In which of the following structures coordination number for cations and anions in the packed structure will be same ?
A. `Cl^-` ion from fcc lattice and `Na^+` ions occupy all octahedral voids of the unit cell
B. `Ca^(2+)` ions from fcc lattice and `F^-` ions occupy all the eight tetrahedral voids of the unit cell
C. `O^(2-)` ions from fcc lattice and `Na^+` ions occupy all the eight tetrahedral voids of the unit cell
D. `S^(2-)` ions from fcc lattice and `Zn^(2+)` ions go into alternate tetrahedral voids of the unit cell
