If the density of a $CsCl$ crystal,which crystallizes in a $bcc$ structure,is $3.988 \, g/cm^3$,then the edge length of the unit cell will be ........ $(CsCl = 168.4 \, g/mol)$.
- A$7.014 \times 10^{-23} \, cm$
- B$5.2 \times 10^{-8} \, cm$
- C$4.1 \times 10^{-8} \, cm$
- D$2.34 \times 10^{-23} \, cm$
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