A patient with peptic ulcer disease (PUD) is prescribed Carafate (sucralfate). What is the primary action of this medication in managing PUD?

Carafate neutralizes gastric acid to reduce irritation.

Carafate inhibits proton pumps to decrease acid production.

Carafate enhances gastric emptying to prevent reflux.

Carafate forms a protective barrier over the ulcer site.