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What type of crystal defect is indicated in the diagram below?
\[
\begin{array}{l}
\mathrm{Na}^{+} \mathrm{Cl}^{-} \mathrm{Na}^{+} \mathrm{Cl}^{-} \mathrm{Na}^{+} \mathrm{Cl}^{-} \\
\mathrm{Cl}^{-} \square \mathrm{Cl}^{-} \mathrm{Na}^{+} \square \mathrm{Na}^{+} \\
\mathrm{Na}^{+} \mathrm{Cl}^{-} \square \mathrm{Cl}^{-} \mathrm{Na}^{+} \mathrm{Cl}^{-} \\
\mathrm{Cl}^{-} \mathrm{Na}^{+} \mathrm{Cl}^{-} \mathrm{Na}^{+} \square \mathrm{Na}^{+}
\end{array}
\]
(1) Interstitial defect
(2) Schottky defect
(3) Frenkel defect
(4) Frenkeland Schottky defects
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