The number of spheres contained $(i)$ in one body centred cubic unit cell and $(ii)$ in one face centred cubic unit cell,is

• A
  In $(i)$ $2$ and in $(ii)$ $4$
• B
  In $(i)$ $3$ and in $(ii)$ $2$
• C
  In $(i)$ $4$ and in $(ii)$ $2$
• D
  In $(i)$ $2$ and in $(ii)$ $3$