An element crystallises in $bcc$ type crystal structure with an edge length of unit cell $300 \ pm$. Calculate the radius of the element.
- A$2.299 \times 10^{-8} \ cm$
- B$1.299 \times 10^{-8} \ cm$
- C$6.920 \times 10^{-8} \ cm$
- D$1.440 \times 10^{-8} \ cm$
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