In fcc lattice, A, B, C, D atoms are arranged at corner, face center, octahedral void and tetrah...

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In fcc lattice, A, B, C, D atoms are arranged at corner, face center, octahedral void and tetrahedral void respectively, then the body diagonal contains:
(a) \( 2 \mathrm{~A}, \mathrm{C}, 2 \mathrm{D} \)
(b) 2A, 2B, 2C
(c) \( 2 \mathrm{~A}, 2 \mathrm{~B}, \mathrm{D} \)
(d) \( 2 \mathrm{~A}, 2 \mathrm{D} \)
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