$A$ metal crystallizes in a $BCC$ structure. The edge length of its unit cell is $3.04 \ \mathring{A}$. What is the volume of its unit cell in $cm^3$?
- A$1.6 \times 10^{21}$
- B$2.81 \times 10^{-23}$
- C$6.02 \times 10^{-23}$
- D$6.6 \times 10^{-24}$
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