What is the coordination number of a particle in an $fcc$ crystal lattice?

In the zinc blende structure,zinc atoms fill up:

If the coordination number of $Ca^{2+}$ in $CaF_2$ is $8$,then the coordination number of $F^{-}$ ion would be

Coordination number of $Na^{+}$ ion in rock salt is

The number of atoms in body-centred and face-centred cubic unit cells are, respectively:

$A$ cubic lattice has $A$ atoms at the body centre,$B$ atoms at the corners,and $C$ atoms at half of the face centres. The formula of the lattice is: