Which of Thfollowing Statements Is Truabout a Normal CFTR Protein

Which of thfollowing statements is truabout a normal CFTR protein?

A) CFTR protein pumps chlorine ions out of the cell.
B) Activity of the CFTR protein causes the surface of epithelial cells to be constantly wet.
C) CFTR protein serves as a receptor that signals the body to the presence of bacteria.
D) CFTR protein allows the mucus to slide easily over epithelial cells.
E) All of these are true.