Using Aperture Priority to determine exposure means:

• A. You set the aperture and the camera chooses the shutter speed
• B. The camera sets both aperture and shutter speed
• C. You set shutter speed and the camera chooses the aperture
• D. You set ISO and the camera adjusts exposure

Answer: (A)

In Aperture Priority, you control depth of field by selecting the aperture, and the camera automatically picks the shutter speed needed to produce a correct exposure based on the meter reading. The ISO setting you’ve chosen (or Auto ISO, if enabled) remains as the exposure base, but the shutter speed is determined by the camera to balance the exposure after you set the aperture. This mode is ideal when you want precise control over how much of the scene is in focus while letting the camera handle the timing of the exposure. The other descriptions describe scenarios where either you’re picking shutter speed, or the camera is choosing both settings, or you’re only adjusting ISO, which doesn’t define exposure balance by itself.