Which language did Glenn Close learn for her role in “Tehran”?

Which language did Glenn Close learn for her role in “Tehran”?

Towards the new season of Apple TV+’s Tehran, premiering May 6, 2022, Glenn Close had to learn Farsi for her role as Marjan Montazeri, a British agent living in Tehran. The series revolves around an Israeli agent and computer hacker who is tasked with infiltrating an electric company in Iran.