Calculate the total volume occupied by all particles in an $fcc$ unit cell if the volume of the unit cell is $6.4 \times 10^{-23} \ cm^3$.
- A$3.321 \times 10^{-23} \ cm^3$
- B$4.350 \times 10^{-23} \ cm^3$
- C$5.126 \times 10^{-23} \ cm^3$
- D$4.736 \times 10^{-23} \ cm^3$
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