An element crystallises in $bcc$ type having atomic radius $1.33 \times 10^{-8} \ cm$,the edge length of the unit cell will be:
- A$2.17 \times 10^{-8} \ cm$
- B$2.66 \times 10^{-8} \ cm$
- C$4.08 \times 10^{-8} \ cm$
- D$3.07 \times 10^{-8} \ cm$
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