Cholesterol Is a Structural Component of Cell Membranes

Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane?

A) A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios.
B) A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios.
C) Membranes with low amounts of cholesterol are very stable and have increased permeability.
D) Membranes with high amounts of cholesterol are very stable and have decreased permeability.