Body centred cubic and face centred cubic unit cells have ${\mathrm{n}}_1$ and ${\mathrm{n}}_2$ effective number of atoms. Which one the following $({\mathrm{n}}_1,{\mathrm{n}}_2)$ combination is correct?

• A

  (4, 1)
• B

  (4, 2)
• C

  (1, 4)
• Correct answer
  D

  (2, 4)

Hence, the correct answer is option: 'D'.