A neonate born at 38 weeks' gestation is admitted to the neonatal nursery for observation. The neonate's mother, who is positive for human immunodeficiency virus (HIV) infection, has received no prenatal care. The mother asks the nurse if her neonate is positive for HIV. The nurse can tell the mother which of the following?

C A complete blood count analysis is the primary method for determining whether the neonate is HIV positive.' B An enlarged liver at birth generally means the neonate is HIV positive.' A More than $50 \%$ of neonates born to mothers who are positive for HIV will be positive at 18 months of age.' D Most neonates are asymptomatic at birth and usually test positive for the HIV antibody at this time.'