Calculate the number of unit cells in $1 \ cm^3$ of an element if the unit cell edge length is $2.0 \times 10^{-8} \ cm$.
- A$3.78 \times 10^{23}$
- B$2.61 \times 10^{23}$
- C$1.25 \times 10^{23}$
- D$4.61 \times 10^{23}$
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