Frenkel defect is caused due to
- AAn ion missing from the normal lattice site creating a vacancy
- BAn extra positive ion occupying an interstitial position in the lattice
- CAn extra negative ion occupying an interstitial position in the lattice
- DThe shift of a positive ion from its normal lattice site to an interstitial site
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$Na^{+} \, Cl^{-} \, Na^{+} \, Cl^{-} \, Na^{+} \, Cl^{-}$
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