Which of the following regarding membrane function is correct?

A)A caveola contains a very high concentration of cholesterol and unsaturated phospholipids.
B)Scaffolding proteins,particularly those containing BAR domains,result in curvature of the cell membrane.
C)Lateral membrane diffusion within a biological membrane is a completely unrestricted process.
D)Membrane fusion with vesicles is often accomplished independently of a SNARE protein.