The first three nearest neighbour distances for a body-centered cubic $(BCC)$ lattice are respectively:
- A$\sqrt{2} \ a, a, \sqrt{3} \ a$
- B$\frac{a}{\sqrt{2}}, a, \sqrt{3} \ a$
- C$\frac{\sqrt{3} \ a}{2}, a, \sqrt{2} \ a$
- D$\frac{\sqrt{3} \ a}{2}, a, \sqrt{3} \ a$
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