Calculate the void volume in an $fcc$ unit cell if the total volume of the unit cell is $6.4 \times 10^{-23} \text{ cm}^3$.
- A$3.172 \times 10^{-23} \text{ cm}^3$
- B$3.911 \times 10^{-23} \text{ cm}^3$
- C$1.664 \times 10^{-23} \text{ cm}^3$
- D$2.051 \times 10^{-23} \text{ cm}^3$
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