Function of tissue plasminogen activator

When serving as a protein therapeutic, the function of tissue plasminogen activator (tPA) is best described in which of the following ways?

Group of answer choices

It serves as a coagulation factor, which, when activated, interacts with other coagulation factors. These interactions set off chemical reactions that lead to the formation of a blood clot.

It is a regulatory enzyme that inhibits the fibrinolysis pathway.

It is an enzyme that provides a novel function to the fibrinolysis pathway.

It is a regulatory enzyme that, when measured in a blood sample, provides a means to quantify the rate of clot formation.

It is a regulatory enzyme that augments the fibrinolysis pathway.