Sedative is to anesthesiologist as capital is to a "D.corporation". This is primarily because sedatives are used by the former to achieve their goals and capital is used by the latter.
So, I'm pretty sure A/V stands for Audio-Visual Professionals. And, those are mostly required in like a large event center for managing all the audio-visual stuff.
Answer:
Protagonist means main character
Explanation:
The protagonist is the main character of the story. Villains can be protagonists, just as heroes can be antagonists. The protagonist is not always the hero. That is why some writers prefer the "protagonist" over the word "hero". Villains could be the main characters of certain stories and heroes the antagonists. For example, "Macbeth" by Shakespeare. Macbeth was not the hero in that story. However, he was the main character.