$A$ face-centered cubic $(FCC)$ solid of an element (atomic mass $60$) has a cubic edge length of $4 \times 10^{-8} \, cm$. If Avogadro's number is $6 \times 10^{23} \, mol^{-1}$,then the density of the solid is:
- A$6.25 \, g/cm^3$
- B$6.25 \, kg/m^3$
- C$10^{-30} \, g/cm^3$
- D$64 \times 10^{-10} \, g/cm^3$
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