Sodium crystallises in $bcc$ structure with radius $1.86 \times 10^{-8} \ cm$. Calculate the edge length of the unit cell.
- A$4.29 \times 10^{-8} \ cm$
- B$6.20 \times 10^{-8} \ cm$
- C$8.05 \times 10^{-8} \ cm$
- D$3.72 \times 10^{-8} \ cm$
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