Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.How many unit cells are there in $1.00cm^3$ of aluminium?

Question

$\begin{array}{1 1}2.26\times 10^{22}\\3.26\times 10^{22}\\1.26\times 10^{22}\\5.26\times 10^{22}\end{array} $