16. Select one of the following concerning Integrins that is not contact:
(a) are cell adhesion molecules that span the cell membrane
(b) serve as a gap junction between the outer membrane surface and its extracellular
surroundings
(c) connect the inner membrane surface to the intracellular cytoskeletal scaffolding
(d) mechanically link the cell's extemal environment and intracellular components
(e) Integnins relay regulatory signals through the cell membrane in either direction