Which of the following, if described by the parents of a child with cystic fibrosis (CF), indicates that the parents understand the underlying problem of the disease? 1. An abnormality in the body's...

Which of the following, if described by the parents of a child with cystic fibrosis (CF), indicates that the parents understand the underlying problem of the disease?

1. An abnormality in the body's mucus-secreting glands.

2. Formation of fibrous cysts in various body organs.

3. Failure of the pancreatic ducts to develop properly.

4. Reaction to the formation of antibodies against streptococcus.