A client with a peptic ulcer who has been prescribed sucralfate asks the nurse to explain how this drug works to heal the ulcer. What is the nurse's BEST response?

"This drug works by providing a protective layer over the ulcer."

"This drug works by preventing the secretion of gastric acids."

"This drug works by neutralizing gastric acid in the stomach."

"This drug works by blocking the H2-receptor for gastric secretions."