The correct option is C AgBr shows both Frenkel and Schottky defect
(a) Frenkel defect does not change the density of the solid.
(b) Frenkel defect is shown by ionic substance in which there is a large difference in the size of ions, for example, ZnS.
(c) AgBr shows both Frenkel and Schottky defect.
(d) Schottky defect decreases the density of the substance.