(i) Frenkel defect

(ii) Schottky defect

(iii) Non-stoichiometric defect

(iv) Simple interstitial defect

Correct Answer: (i) Frenkel defect

Explanation: In Frenkel defect, the atom is removed from its lattice position to the inner surface, which creates vacancies. Here, since the atoms are dislocated in the lattice point, it is also known as dislocation defect.