Which of the following statements accurately describes a characteristic of the newborn immune system?

Newborns are born with fully developed immune responses capable of independently fighting infections from birth.

Newborns have a mature gut microbiome that supports their immune system immediately after birth.

Newborns rely solely on their innate immune system without any contribution from maternal antibodies.

Newborns receive passive immunity through the placenta and colostrum, but their own immune system is not fully functional until several months of age.