\( \mathrm{Na} \) and \( \mathrm{Mg} \) crystallize in \( \mathrm{BCC} \) and \( \mathrm{FCC} \)...

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\( \mathrm{Na} \) and \( \mathrm{Mg} \) crystallize in \( \mathrm{BCC} \) and \( \mathrm{FCC} \) crystals respectively, then the number of atoms of \( \mathrm{Na} \) and \( \mathrm{Mg} \) present in the unit cell of their respective crystal is
(a) 4 and 2
(b) 9 and 14
(c) 14 and 9
(d) 2 and 4
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