The practical nurse (PN) is observing a client self-administering the noon dose of subcutaneous insulin. What step of the injection technique should the practical nurse (PN) reteach?

Selects the same site that was used for the previous injection.

Inserts the needle at a 90 degree angle to the skin surface.

Uses a circular action when applying an alcohol pad to the site.

Injects air into the insulin vial to displace the dose.