In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: In what year did Harris Yulin appear in Duet? Passage:On television, Yulin appeared in  in the episode "Duet". During the second season of the TV series 24, he played the Director of the National Security Agency, Roger Stanton. He was nominated for a 1996 Emmy for his portrayal of crime boss Jerome Belasco in the sitcom Frasier. In the series Buffy the Vampire Slayer, he played Quentin Travers, head of the Watchers' Council. Yulin also appeared in Season 3 of Entourage in the episode "Return of the King" as studio head Arthur Gadoff. In 2009, he performed in The People Speak, a documentary feature film that uses dramatic and musical performances of the letters, diaries, and speeches of everyday Americans, based on historian Howard Zinn's A People's History of the United States. In 2010 he appeared in the AMC series Rubicon.
 Links: a. Frasier b. Duet (Star Trek: Deep Space Nine) c. Watcher (Buffy the Vampire Slayer) d. The People Speak (film)
b