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

How to test peripheral vision
Start with a simple confrontational visual field exam.
For this peripheral vision test, your eye doctor will sit right across from you and ask you to cover one eye. You'll be asked to stare straight ahead while they slowly bring one of their hands from one side into your peripheral vision.

Options: (a). Say " ok " or " i see it " when you detect their hand moving. This is a standard test during most eye exams.; (b). Your eye doctor then makes a small gloved fist and points the index finger towards the primary eye between your eyes. You can choose to move your body just slightly forward to expose your peripheral vision, or to point upwards.; (c). You'll likely be blindfolded to make this approach easier. If your doctor decides to confront you about your vision, ask them to explain your vision as clearly as possible.; (d). The doctor will then take a half-inch measurement from the center of one of your eyes. For large eyes, a third-inch measurement will be more than enough.;
The answer is:
(a).