What are the recommendations to stop the illegal traffic of totoaba and save the vaquita?

I. The Mexican government should intervene immediately to enforce the law and eliminate gillnets in the vaquita habitat.
II. Safe fishing gear should be developed and implemented to protect the vaquita.
III. GPS monitoring systems should be installed on all fishing vessels in the Upper Gulf of California.
IV. The governments of Mexico, China, and the United States should dedicate substantial resources to a thorough investigation of the illegal totoaba traffic.
a) I and II are correct.
b) I, II, and III are correct.
c) I, II, III, and IV are correct.