Which of the following is a correct statement regarding defects in crystalline solids?

Frenkel defect is a dislocation defect. It arises due to a vacancy at a cationic site. The cation moves to another position between the two layers and is surrounded by a greater number of anions. Frenkel defects are found in ZnS, AgBr, AgI, AgCl, etc. Due to Schottky defects, the density of crystals decreases. Frenkel defects have no effect on the density of crystalline solids.