An element has a body centered cubic (bcc) structure with a cell edge of $288\text{pm}$. The atomic radius is:

1. A
   $\frac{\sqrt{3}}{4}\times 288\text{pm}$
2. B
   $\frac{\sqrt{2}}{4}\times 288\text{pm}$
3. C
   $\frac{4}{\sqrt{3}}\times 288\text{pm}$
4. D
   $\frac{4}{\sqrt{2}}\times 288\text{pm}$