During a well-check for a 12-month-old, the nurse plans to administer the first dose of the varicella vaccine. What is an appropriate action for the nurse to take?

A. Mild illnesses like nasopharyngitis (a common cold) do not typically contraindicate vaccination, so there is no need to delay immunization. B. It is essential to evaluate for allergies to vaccine components, such as gelatin or neomycin, which could contraindicate the administration of the varicella vaccine. C. The first dose of the varicella vaccine is recommended at 12-15 months of age, not at 4 years of age, so it is appropriate to administer it during this well-check. D. The varicella vaccine is administered subcutaneously, not intramuscularly, so this is not the correct route for administration.