A)depends on formation of clathrin coated pits that pinch off. B)is used to internalize molecules such as hormones,growth factors,iron,and cholesterol. C)involves formation of caveolae that are enriched in cholesterol and caveolin. D)is typically used to internalize plasma membranes added by exocytosis. E)depends on formation of clathrin coated pits that pinch off and is used to internalize molecules such as hormones,growth factors,iron,and cholesterol.