For a manual zoom camera, you can adjust the knob labeled N--F to ( )...

The correct answer is C . In manual zoom lens terminology, N--F stands for Near to Far , which is the focus adjustment range, while W--T stands for Wide to Tele , which is the focal length or zoom adjustment range. This is standard optical-camera labeling and is consistent with the training material’s broader treatment of camera angle and image adjustment, where physical image tuning is performed through controlled mechanical or optical adjustment rather than through resolution changes alone. The material also shows that image framing and observation behavior depend on controlled camera adjustment, for example through tilt, horizontal, and vertical tuning during installation.

From an optical engineering standpoint, focus adjustment changes the sharpness plane of the subject, while focal length adjustment changes the field of view and magnification. Therefore, a technician first uses the W--T ring to set the desired scene scale and then uses the N--F ring to make the image sharp at the chosen distance. Since the question asks which function each labeled knob performs, N--F = adjust the focus position and W--T = adjust the focal length , making C the only correct option.