Which of these steps is NOT a part of platelet plug formation?
A) Integrins on the surface of the platelets adhere to collagen.
B) Platelets release ADP and thromboxanes.
C) Prothrombinase is released by smooth muscle cells.
D) More platelets are activated and release ADP and thromboxanes.
E) Activated platelets are connected to each other by fibrinogen.