If all the atoms touching 1 face plane are removed in a solid \( \mathrm{A}^{+} \mathrm{B}^{-} \...

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If all the atoms touching 1 face plane are removed in a solid \( \mathrm{A}^{+} \mathrm{B}^{-} \)having rock salt type structure, then the formula of the left compound and defect brought by this removal respectively is:
(a) AB, Frenkel defect
(b) \( \mathrm{A}_{2} \mathrm{~B} \), Frenkel defect
(c) AB, Schottky defect
(d) \( \mathrm{A}_{2} \mathrm{~B} \), Schottky defect
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