The is an imaginary horizontal line between the main characters being photographed and determines where the camera should be placed to preserve screen direction (continuity).

Axis of Action.

Explanation:

Axis of action is a tool used in film making to create a spatial relationship between all objects of the scene and the characters. It is also called a 180-degree line.

Mostly camera is placed on this axis of line and is not permitted to move. There can be a shift in the axis of action when the character makes the movement or shifts. In the cinematography line, a camera is never allowed to cross this axis of action because in doing so it can distract the audience.

So, the correct answer is the axis of action.

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