What should the parent of a child with chickenpox be advised by a nurse regarding when the child is considered no longer contagious?

Rationale: A. The appearance of blisters indicates an active, contagious stage, not the end of contagion. B. Absence of fever does not indicate that the virus is no longer contagious. C. A child with chickenpox is no longer considered contagious once all lesions have crusted over, which typically occurs about 5–7 days after the rash first appears. D. Chickenpox is a viral infection; antibiotics are not used unless there is a secondary bacterial infection, so this does not apply.