The $C{a}^{2+}$ and $F^{–}$ ions are located in $Ca{F}_2$ crystal, respectively at face centred cubic

The $F^{–}$ and $C{a}^{2+}$ and tetrahedral voids, respectively, are seen in the $Ca{F}_2$ crystal at face-centered cubic lattice sites. The fluorite structure is another name for the calcium fluoride structure. The coordination numbers of the $C{a}^{2+}$ and $F^{–}$ ions are 8 and 4 ions, respectively, in an 8:4 configuration. 
Hence, the correct option is option (A) Tetrahedral voids.