Regarding the Relationship Between the Client and Agency, Things Will

Regarding the relationship between the client and agency, things will go most smoothly and efficiently when

A) you see them as equal forces with equal power and responsibility.
B) you can identify two distinct entities with clearly defined roles and tasks.
C) you can tell that the agency does everything the client wants without question.
D) you can't tell where the work of one ends and the other begins.