How many `TVs` and `OV s` occur per unit cell and per atom in a closest packed structure?

Where the TVs and OV s are located in a closet packed structure?

Where the TVs and OV s are located in a closet packed structure?

Position of TVs in closest packed structure is//are

Position of TVs in closest packed structure is//are

Position of TVs in closest packed structure is//are

with the help of a labelled diagram show that there are four octahedral voids per unit cell in cubic close packed structure .

With the help of a labelled diagram show that there are four octahedral voids per unit cell in cubic close packed structure .

The unit cell present in ABAB, closest packing of atoms is: