Identify the correct statement about the research methodology used in the study. The author used primary and secondary sources of information to d...

Identify the correct statement about the research methodology used in the study.

The author used primary and secondary sources of information to develop the study.
The author used the technique of hidden client to analyze the marketing of clothing stores.
The author used the technique of hidden client to analyze the competition of imported jacket stores.
The author used the systemic character perspective to analyze the organizational diagnosis.
a) I and II are correct.
b) II and III are correct.
c) III and IV are correct.
d) I and IV are correct.