$Na$ and $Mg$ crystallise in $b.c.c.$ and $f.c.c.$ type crystals respectively. The number of atoms of $Na$ and $Mg$ present in the unit cell of their respective crystals is:
- A$4$ and $2$
- B$9$ and $14$
- C$14$ and $9$
- D$2$ and $4$
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