Please choose the correct ending to complete the given sentence: Health: [header] How to save money on contact lenses [title] Keep a copy of your prescription. [step] 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.

Ending1: [title] Ask if your eye doctor will match online prices. [step] If they will, this offers the best of both worlds. Ending2: [substeps] Always have your prescription available at all times to keep it handy. At the very least, follow the prescription instructions. Ending3: [title] Consider the age and condition of your lenses. [step] Assume that you have very few contact lenses and want to repair them. Ending4: [substeps] Don't spend unnecessary money or long hours learning about lenses. [title] Locate local or national stores that carry professional lenses.

Answer format: ending1/ending2/ending3/ending4