Calculate the edge length of $fcc$ unit cell if the radius of the metal atom is $139 \ pm$.
- A$2.78 \times 10^{-8} \ cm$
- B$3.21 \times 10^{-8} \ cm$
- C$3.93 \times 10^{-8} \ cm$
- D$6.95 \times 10^{-8} \ cm$
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