Relation between the atomic radius and the edge length of a bcc unit cell

1. A.
   $a = \frac{\sqrt{3}r}{4}$
2. B.
   $a = \frac{4}{\sqrt{3}}r$
3. C.
   $a = \frac{\sqrt{3}}{4}r$
4. D.
   $a = \frac{4r}{\sqrt{3}}$

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1. A.
   $r = a/2$
2. B.
   $r = \sqrt{3}a/4$
3. C.
   $r = \sqrt{2}a/4$
4. D.
   $r = a/\sqrt{2}$

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