Final answer:
A congenital disorder is a condition present at birth, either inherited or due to environmental factors, not necessarily caused by neonatal infections.
Step-by-step explanation:
A congenital disorder is one that is present at birth. This can include conditions that are inherited or result from environmental factors that affect development in the womb. Congenital disorders are not typically caused by viral infections acquired during childhood or the neonatal period, though some viruses can cause congenital defects if a mother is infected while pregnant. For example, neonatal herpes can be transferred from the mother to the newborn during childbirth, potentially leading to serious complications. Similarly, congenital rubella syndrome can occur if a pregnant woman contracts rubella, leading to severe developmental defects in the fetus. Therefore, the correct answer to the question is option b) – is present at birth.