Sodium crystallizes in $bcc$ structure with radius $1.86 \times 10^{-8} \text{ cm}$. What is the edge length of unit cell of sodium?
- A$4.3 \times 10^{-8} \text{ cm}$
- B$3.72 \times 10^{-8} \text{ cm}$
- C$7.44 \times 10^{-8} \text{ cm}$
- D$5.26 \times 10^{-8} \text{ cm}$
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