A school nurse is assessing a child and discovers Koplik spots on the child's buccal mucosa. Which of the following actions should the nurse take?

Ask the caregivers if the child recently used alcohol-based mouthwash.

Check the child's classmates for parotid gland enlargement.

Instruct the caregivers to increase the child's Vitamin B12 intake.

Review the immunization records of the child's classmates.