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?

Review the immunization records of the child’s classmates.

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

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

Check the child's classmates for parotid gland enlargement.