In a face-centred cubic $(FCC)$ unit cell,what is the total volume occupied by the atoms?
- A$\frac{4}{3} \pi r^3$
- B$\frac{8}{3} \pi r^3$
- C$\frac{16}{3} \pi r^3$
- D$\frac{64 r^3}{3 \sqrt{3}}$
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