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What type of crystal defects is indicated in the diagram given below?
\( \begin{array}{llllll}\mathrm{Na}^{+} & \mathrm{Cl}^{-} & \mathrm{Na}^{+} & \mathrm{Cl}^{-} & \mathrm{Na}^{+} & \mathrm{Cl}^{-} \\ \mathrm{Cl}^{-} & \square & \mathrm{Cl}^{-} & \mathrm{Na}^{+} & \square & \mathrm{Na}^{+} \\ \mathrm{Na}^{+} & \mathrm{Cl}^{-} & \square & \mathrm{Cl}^{-} & \mathrm{Na}^{+} & \mathrm{Cl}^{-} \\ \mathrm{Cl}^{-} & \mathrm{Na}^{+} & \mathrm{Cl}^{-} & \mathrm{Na}^{+} & \square & \mathrm{Na}^{+}\end{array} \)
(A) Frenkel and Schottky defects
(B) Schottky defects
(C) Interstitial defects
(D) Frenkel defects
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