Non-stoichiometric defects do not include which of the following?

$KBr$ is doped with $10^{-5}$ mole percent of $SrBr_2$. The number of cationic vacancies in $1 \ g$ of $KBr$ crystal is ........ $\times 10^{14}$. (Round off to the Nearest Integer).
[Atomic Mass : $K = 39.1 \ u$,$Br = 79.9 \ u$; $N_A = 6.023 \times 10^{23} \ mol^{-1}$]

In an ionic solid,equal number of cations and anions are missing from their regular positions in the crystal lattice,creating vacancies. This is called-

Which of the following crystals exhibits both Schottky and Frenkel defects?

What type of stoichiometric defect is shown by:
$(i)$ $ZnS$
$(ii)$ $AgBr$

When $SrCl_2$ is added to molten $NaCl$ and crystallized,the defect formed is ........