Identify the correct statement about the crystal defects in solids.

  • A
    Frenkel defect is favoured when the difference between sizes of cation and anion is very small.
  • B
    Frenkel defect is not a dislocation effect.
  • C
    Schottky defects have no effect on physical properties of solids.
  • D
    Trapping of electrons in lattice leads to the formation of $F$-centres.

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