Please choose the correct ending to complete the given sentence: Putting in contact lenses: There's an optometrist seated with his patient in front of a phoropter in his clinic, talking about contact lenses and its maintenance. he

Ending1: shows off the mechanics of a plastic desktop. Ending2: shows a ceramic-like glass object that looks like the design featured on the nike business logo. Ending3: touches the thing, puts a plate, then rubs a clear patch across the eyelid of the telephone receiver in a landline manner. Ending4: explains what are the correct ways to put on contact lenses and also how to keep them clean.

Answer format: ending1/ending2/ending3/ending4