Which of the following is an accurate description of cavelolae?

A) Small, flask-shaped invaginations of the plasma membrane enriched in cholesterol.
B) Vesicles surrounded by a cage of clatherin proteins.
C) Regions of the plasma membrane rich in cell signaling molecules.
D) A cytoskeletal network that is involved in transport of vesicles to the nucleus.
E) A cellular motor protein that is involved in intracellular transport.