What is the importance of the mucins that are released by salivary glands?

A)They aid in degradation of triglycerides to fatty acids and monoglycerides.
B)They begin the process of starch digestion.
C)They are hormonal molecules that stimulate the release of gastric juice by the stomach in anticipation of receipt of the contents of the mouth.
D)They are glycoproteins that make food slippery enough to slide easily through the esophagus.
E)They begin the process of protein digestion.