What is the coordination number of atoms:- in a cubic close packed structure?

Options

A. `Cl^-` ion form fee lattice and `Na^+` ions occupy all octahedral voids of the unit cell
B. `Ca^(2+)` ions form fee lattice and `F^-` ions occupy all the eight tetrahedral voids of the unit cell.
C. `O^2-` ions form fee lattice and `Na^+` ions occupy all the eight tetrahedral voids of the unit cell.
D. `S^2-` ions form fee lattice and `Zn^(2+)` ions go into alternate tetrahedral voids of the unit cell.