Which of the following stoichiometric point defects are shown by AgBr_(s) crystals?

(I) Schottky defect
(II) Frenkel defect
(III) Metal excess defect
(IV) Metal deficiency defect

• A

  (I) and (II) only

• B

  (III) and (IV) only

• C

  (I) , (II) and (III) only

• D

  (II) and (IV) only