The incorrect statement regarding defects in crystalline solid is

The correct statement$(s)$ regarding defects in solids is(are):
$A$. Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion.
$B$. Frenkel defect is a dislocation defect.
$C$. Trapping of an electron in the lattice leads to the formation of $F$-center.
$D$. Schottky defects have no effect on the physical properties of solids.

Explain the following term with a suitable example:
$(iii)$ Interstitials

Explain the following term with a suitable example:
$(iv)$ $F$-centres

Explain the following term with a suitable example:
$(ii)$ Frenkel defect

Which of the following represents the lattice structure of $A_{0.95} O$ containing $A^{2+}$,$A^{3+}$,and $O^{2-}$ ions?