Where is the protease pepsin primarily active and what substrate does it act upon?

Pepsin is primarily active in the stomach and acts on proteins, breaking them into smaller peptides

Pepsin is a brush-border enzyme in the small intestine that converts monosaccharides into polysaccharides

Pepsin is primarily active in the mouth and acts on carbohydrates to produce glucose

Pepsin is secreted by the pancreas and primarily digests triglycerides into fatty acids