Which of the Following Statements Are True of Gut Hormone

Which of the following statements are true of gut hormone structure and functions?
1) Gut hormones regulate digestion and absorption.
2) Gut hormones are released in response to nutrients in the lumen of the GI tract and stimulate the release of acid, bicarbonate, and enzymes for the digestion of food.
3) Secretin, cholecystokinin, vasoactive intestinal polypeptide, and pancreatic polypeptide are involved in regulating insulin and glucagon production.
4) Glucagon-like peptide 1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) control exocrine pancreatic function.

A) 1, 2, 3, 4
B) 1, 3, 4
C) 2, 4
D) 1, 2