Atoms of the same radius $r$ are packed in simple cubic (sc), bcc and fcc arrangements. Which statements about the cell volume per atom are correct?

1. AIn bcc it is $\frac{32r^3}{3\sqrt{3}}\approx 6.16r^3$.
2. BIn sc it is $8r^3$.
3. CIt is larger in fcc than in bcc.
4. DIn fcc it is $8\sqrt{2}{r}^3$.