[nadezhda18]

It should be none of them, it should be TN

"The nonimmigrant NAFTA Professional (TN) visa allows citizens of Canada and Mexico, as NAFTA professionals, to work in the United States"[0]

[0] https://travel.state.gov/content/travel/en/us-visas/employme...

[gnulinux]

Oh I see. I work on OPT, but am not Mexican or Canadian citizen. I think all STEM majors who studied in an American university have the right to work in US for 3 years in a job very close to what they studied.