This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to use a monocular
Use your dominant eye.
If you have impaired vision, it is important to use the eye with the best vision. This can be helpful even if you have normal vision.

Choose your answer from:
-Hold the monocular up against this eye while using. Be sure to hold the monocular with the hand on the same side as the dominant eye.
-The optical focus effect of an monocular is impaired with your dominant eye, so it is important to maintain focus well and consistently while taking the monocular. In practice, the monocular should be the same size as your eye.
-As always, provide your glasses to protect your field vision, even if it is too dark outside. Point your non-dominant eye at an object.
-Find the first tint of blue in the light bulb. Use your dominant eye, the inner piece of the monocular, to place shadow over the highlighter.
The answer is:
Hold the monocular up against this eye while using. Be sure to hold the monocular with the hand on the same side as the dominant eye.