Which of the following statements about the working principle behind a basic still camera is true? its not c i tryed

a) light entering the camera through a nonadjustable opening is focused on light- sensitive film at the back of the camera.

b) light entering the camera through a light-sensitive opening is focused on 35 mm film at the back of the camera.

c) not this answer its either a or b)
changeable lenses of different focal lengths allow light to enter the camera, which then forms the image on light-sensitive film