What is the diagnosis and treatment of acute pulmonary thromboembolism?

The pathogenesis of pulmonary embolism is a consequence of primary (hereditary) risk factors along with acquired factors.
The effects of pulmonary embolism are hemodynamic and evident from a clinical point of view when the pulmonary vasculature is compromised by more than 30%.
The electrocardiogram is not of great utility for the diagnosis of pulmonary embolism.
The angiography is an invasive study that was considered the gold standard for many years.
a) Only statements I and II are correct.
b) Only statements II and III are correct.
c) Only statements III and IV are correct.
d) All statements are correct.