$A$ metal crystallises in a body-centred cubic $(BCC)$ lattice with the metallic radius $\sqrt{3} \ \mathring{A}$. The volume of the unit cell in $m^3$ is:

  • A
    $64 \times 10^{-29}$
  • B
    $4 \times 10^{-29}$
  • C
    $6.4 \times 10^{-29}$
  • D
    $4 \times 10^{-10}$

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