In Film Theory, What Does the Concept of "Mediation" Mean

In film theory, what does the concept of "mediation" mean?

A) Film is a medium through which visual information is captured and represented.
B) Film is a significant tool by which the news media creates ideological material.
C) It refers to the bargaining process by which film companies and unions negotiate contracts.
D) It refers to the cinematic apparatus as a collective entity.
E) It refers to the process by which an agent, structure, or other formal element transfers something from one place to another.