What type of crystal defect is indicated in the diagram below [AIEEE 2004] \[N{{a}^{+}}\,\,C{{l}^{-}}\,\,N{{a}^{+}}\,\,C{{l}^{-}}\,\,\,N{{a}^{+}}\,\,\,C{{l}^{-}}\] \[C{{l}^{-}}\] ¨ \[C{{l}^{-}}\]\[N{{a}^{+}}\] ¨ \[N{{a}^{+}}\] \[N{{a}^{+}}\]\[C{{l}^{-}}\]¨\[C{{l}^{-}}\]\[N{{a}^{+}}\]\[C{{l}^{-}}\] \[C{{l}^{-}}\]\[N{{a}^{+}}\]\[C{{l}^{-}}\]\[N{{a}^{+}}\] ¨ \[N{{a}^{+}}\]

• A. Interstitial defect
• B. Schottky defect
• C. Frenkel defect
• D. Frenkel and Schottky defects