Multi-select problem: How does the next paragraph end?

How to use an ophthalmoscope
Determine if the ophthalmoscope is working properly.
Turn the power switch to the on position to check if the light works. If not, replace the batteries and try again.

Choices:
i. Look through the aperture (eyepiece) to ensure clarity. Remove or slide open the aperture's cover if one exists.;
ii. If the light plays on and/or makes noises, then the ophthalmoscope is functioning properly. It may be necessary to replace the batteries if there are still noises or light is still flickering.;
iii. If the light does not click on, this indicates that the light is dead and unusable. Clean the lens using a lens wipe.;
iv. If it is not working, replace the batteries and make sure the aperture is not too large. If the aperture seems too small, dial the power switch.;
i.