Calculate the volume occupied by all atoms in a $bcc$ unit cell if the volume of the unit cell is $1.5 \times 10^{-22} \ cm^3$.

• A
  $2.40 \times 10^{-22} \ cm^3$
• B
  $3.51 \times 10^{-22} \ cm^3$
• C
  $1.56 \times 10^{-22} \ cm^3$
• D
  $1.02 \times 10^{-22} \ cm^3$