Select the correct statement(s) for the rock-salt structure \( (\mathrm{NaCl}) \) : (a) The tetr...

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Select the correct statement(s) for the rock-salt structure \( (\mathrm{NaCl}) \) :
(a) The tetrahedral voids are smaller than the octahedral sites
(b) The octahedral voids are occupied by cations and the tetrahedral sites are empty
(c) The radius ratio \( \left(r_{c} / r_{a}\right) \) is \( 0.225 \)
(d) The radius ratio \( \left(r_{c} / r_{a}\right) \) is \( 0.732 \)
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