The community psychologist:

I. Develops community programs to promote mental health.
II. Organizes a population to meet their basic needs.
III. Operates the planning of social psychologists at a micro-population level.
IV. Applies tests to sectors of the population to know their attitudes or customs.
a) I and II are correct.
b) II and III are correct.
c) III and IV are correct.
d) I, II, and III are correct.
e) All except "d".