An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is:
A $\frac{\sqrt{2}}{4}\times288\ pm$
B $\frac{4}{\sqrt{3}}\times288\ pm$
C $\frac{4}{\sqrt{2}}\times288\ pm$
D $\frac{\sqrt{3}}{4}\times288\ pm$