Answer : 3. "Killian Murphy"
Explanation :

'Oppenheimer' directed by Christopher Nolan won three awards at the Screen Actors Guild (SAG) Awards. The Best Male Actor award was given to Cillian Murphy for his brilliant performance in Oppenheimer. Robert Downey Jr. received the award for Best Actor in a Supporting Role. Oppenheimer also received the Best Film Artists Award. This year's Lifetime Achievement Award was given to veteran singer and actress Barbra Streisand.