If $M$ is the atomic mass of an element and $a$ is the edge length of the unit cell,then the formula to calculate the density $\rho$ is:
- A$\rho = \frac{n M}{a^3 N_A}$
- B$\rho = \frac{a^3 N_A}{n \times M}$
- C$\rho = \frac{a^3 M}{n N_A}$
- D$\rho = \frac{M N_A}{a^3 n}$
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