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

How to save money on contact lenses
Keep a copy of your prescription.
You will need a prescription from within the last year to order contacts, so always ask your eye doctor for a copy after an exam. If you are considering trying to order contacts without an up-to-date prescription, know that online sellers are required to contact your doctor to verify your prescription.

OPTIONS:
[i] Ask if your eye doctor will match online prices. If they will, this offers the best of both worlds..
[ii] Always have your prescription available at all times to keep it handy. At the very least, follow the prescription instructions..
[iii] Consider the age and condition of your lenses. Assume that you have very few contact lenses and want to repair them..
[iv] Don't spend unnecessary money or long hours learning about lenses. Locate local or national stores that carry professional lenses..
The answer is:
[i]