The correct answer is option 1: Liver. The liver is an important organ that performs various functions in the body, such as producing bile to aid in digestion. However, it does not secrete any digestive enzymes.

Option 2: Salivary glands secrete saliva, which contains an enzyme called amylase that helps break down carbohydrates in the mouth.

Option 3: The glands of the small intestine secrete enzymes, such as lipase, amylase, and protease, that play a crucial role in digesting fats, carbohydrates, and proteins.

Option 4: The pancreas is an important organ in the digestive system that secretes several digestive enzymes, including amylase, lipase, and trypsin, which break down carbohydrates, fats, and proteins respectively.

Therefore, the liver is the only option that does not secrete any digestive enzymes.