One common result of phospholipid signaling pathways downstream of G-protein activation is a phenomenon by which waves and oscillations of calcium ions can be produced that sweep across a cell. The statements below are characteristic of these calcium ion waves EXCEPT: A. They are much slower than diffusion of calcium ions through the cytoplasm. B. They maintain the same strength (i.e., calcium ion concentration peaks) throughout the wave. C. They move in a directional pattern due to both positive and negative feedback mechanisms. D. They occur due to opening and closing of phospholipid-gated ion channels in the ER membrane. E. They can be compared to how an action potential will travel along the membrane of an axon..