Which is /are correct statement about zinc blende structure ?

Options

A. The number of first neighbours of `S^(2-)` is 4
B. The maximum distance `Zn^(2+)` is `asqrt(3)/(2)` , where 'a' = egde length of unit cell
C. If all tetrahedral voids are occupied by `Zn^(2+)` then C.N. of `S ^(2-)` is 8
D. If all tetrahedral voids are occupied by `Zn^(2+)` then C.N. change from 4: 4 to 8: 8.

Answer

A, B, C