(I for Populations Scattered in a Wide Area, the Preferred

(i. For populations scattered in a wide area, the preferred technique for sampling is cluster sampling. (ii) If the population can be divided into homogeneous subgroups, stratified random sampling is the best sampling method to use.
(iii) If every k-th item in the population sequence is selected, you are using systematic random sampling.

A) (i) , (ii) , and (iii) are all correct statements
B) (i) and (ii) are correct statements but not (iii) .
C) (i) and (iii) are correct statements but not (ii) .
D) (ii) and (iii) are correct statements but not (i) .
E) (i) , (ii) , and (iii) are all false statements.