Which of the following statements is/are correct? (a) In an anti-fluorite structure, anions from...

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Which of the following statements is/are correct?
(a) In an anti-fluorite structure, anions from FCC lattice and cations occupy all tetrahedral voids.
(b) If the radius of cations and anions are \( 0.2 \AA \) and \( 0.95 \AA \), then coordinate number of cation in the crystal is 4 .
(c) An atom/ion is transferred from a lattice site to an interstitial position in Frenkel defect
(d) Density of crystal always increases due to substitutional impurity defect.
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