First three nearest neighbour distances for primitive cubic lattice are respectively (edge lengt...

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First three nearest neighbour distances for primitive cubic lattice are respectively (edge length of unit cell \( =a \) ) :
(a) \( a, \sqrt{2} a, \sqrt{3} a \)
(b) \( \sqrt{3} a, \sqrt{2} a, a \)
(c) \( a, \sqrt{2} a, 2 a \)
(d) \( a, \sqrt{3} a, 2 a \)
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