In a body-centred cubic unit cell of caesium  

• A

  $\text{ the edge length is equal to }\frac{4\mathrm{r}}{\sqrt{3}}$

• B

  $\text{ the edge length is equal to }\frac{4\mathrm{d}}{\sqrt{3}}\text{ where }\mathrm{d}\text{ is the minimum }$

• C

  $\text{ the edge length is equal to }\frac{2\mathrm{d}}{\sqrt{3}}\text{ where }\mathrm{d}\text{ is the minimum }$distance between two lattice points

• D

  the square of the edge length is equal to 16r² where ‘r’ is the radius of a lattice point