An element is found to crystallize with $BCC$ structure having density $8.55 \ g \ cm^{-3}$. What is the edge length of the unit cell? (Atomic mass of element $= 93$)
- A$(3.61 \times 10^{-23})^{1/3} \ cm$
- B$(3.91 \times 10^{-20})^{1/3} \ cm$
- C$(3.01 \times 10^{-224})^{1/3} \ cm$
- D$(3.30 \times 10^{-20})^{1/3} \ cm$
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