What are the number of octahedral and tetrahedral voids in $0.3 \ mol$ of a substance respectively,if it forms an $hcp$ structure?

• A
  $1.8066 \times 10^{23}$ and $3.6132 \times 10^{23}$
• B
  $3.6132 \times 10^{23}$ and $1.8066 \times 10^{23}$
• C
  $6.022 \times 10^{23}$ and $12.044 \times 10^{23}$
• D
  $12.044 \times 10^{23}$ and $6.022 \times 10^{23}$