Calculate the edge length of a unit cell for a metal with an atomic radius of $128 \ pm$ that forms an $fcc$ unit cell structure.
- A$3.62 \times 10^{-8} \ cm$
- B$2.56 \times 10^{-8} \ cm$
- C$2.96 \times 10^{-8} \ cm$
- D$3.12 \times 10^{-8} \ cm$
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