Question

where must the camera be placed in relation to the axis of action?
on one side of the axis of action but also on the opposite side if the need for further coverage calls for such a switch
on both sides of the axis of action depending on the director’s fancy
on both sides of the axis of action in alternating sequence
on both sides of the axis of action in random sequence
on one side and one side only of the axis of action

Explanation:

The axis of action (180-degree rule) is a core filmmaking principle to maintain spatial continuity. Cameras must stay on one consistent side of this axis to avoid disorienting the viewer. Switching to the opposite side without proper transitional shots breaks continuity, so the camera should remain on only one side.

Answer:

on one side and one side only of the axis of action