An element crystallizes in a body-centred cubic $(BCC)$ structure with an edge length of $400 \ pm$. Calculate the interatomic distance in the crystal. Additionally, if an atom has a radius of $300 \ pm$ and crystallizes in a face-centred cubic $(FCC)$ lattice, calculate the distance between the nearest neighbours.

  • A
    $346.4 \ pm, 424.2 \ pm$
  • B
    $200 \ pm, 600 \ pm$
  • C
    $346.4 \ pm, 600 \ pm$
  • D
    $400 \ pm, 300 \ pm$

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