A nurse is providing teaching for a parent of a preschool-aged child who had a myringotomy with a tympanoplasty tube insertion 4 days ago. Which of the following actions should the nurse identify as an indication that the teaching was effective?

The child's parent applies the prescribed medication as instructed.

The parent allows their child to attempt to lift their older sibling above the ground.

The child's parent enforces nose blowing only when necessary.

The child's parent states that they developed a plan to have their child use ear plugs in the shower.

The parent noticed purulent drainage from their child's ear and immediately reported it to the surgeon.