$A -$ Secretin acts on the exocrine pancreas and stimulates the secretion of water and bicarbonate ions. $R -$ Cholecystokinin $(CCK)$ acts on both the pancreas and the gall bladder and stimulates the secretion of pancreatic enzymes and bile juice,respectively.

• A
  $A$ and $R$ both are correct.
• B
  $A$ and $R$ both are incorrect.
• C
  $A$ is correct and $R$ is incorrect.
• D
  $A$ is incorrect and $R$ is correct.