Given the task definition and input, reply with output. In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Question: What year did Ali Parvin become technical director of Steel Azin? Passage 1:Mohammad Parvin began his career at the Persepolis youth academy in Tehran before signing his first pro contract in 2005. Despite the fact that his father was the head coach of the team, he remained unused until making his debut in a friendly match against German giants Bayern Munich. Being dubbed as a future star player in the national team, his time at Persepolis turned difficult following his fathers departure as a coach. He later followed his Parvin senior, who had become technical director of Steel Azin, and became the top scorer in the first division. Following a remarkable season in a star-studded second tier side, he chose to move soon, again shortly after his fathers resignation. Despite reportedly being offered a contract by Persepolis, he moved to Saipa. It was speculated that the reason for his refusal to play at Persepolis was the troublesome relationship between Dariush Mostafavi (then Club CEO at Persepolis) and his father Ali Parvin. After only 12 performances at Saipa, he spent 6 successful months on loan at Dunajská Streda in Europe only to return to his beloved Persepolis in July 2009. His second stint at the continents most popular football team, was another difficult experience and Mohammad was on the move once again in 2011. His next stop was Paykan, another short term stint as soon newly promoted Gahar Zagros followed.
 Passage 2:Williamson's early film work included roles in M*A*S*H (1970) and Tell Me That You Love Me, Junie Moon (1970). He portrayed an escaped slave who flees westward in The Legend of Nigger Charley (1972). He played the role of an African-American gangster in the film Black Caesar (1973) and its subsequent sequel, Hell Up in Harlem (also 1973). Williamson also starred in the 1975 western film Boss Nigger, in which he played the title role. After this he appeared as an actor in several films, most of which are considered to be of the "blaxploitation" genre. Williamson starred alongside Peter Boyle and Eli Wallach in the movie Crazy Joe (1974). In 1974, Williamson was selected by the ABC television network as a commentator on Monday Night Football to replace Don Meredith, who had left to pursue an acting and broadcasting career at rival network NBC. Williamson was used on a few pre-season broadcasts, but was quickly declared unsuitable by ABC. He was relieved of his duties at the beginning of the regular season, becoming the first MNF personality not to endure for an entire season. He was replaced by the fellow former player (and fellow Gary, Indiana, native) Alex Karras.
 Passage 3:Huff was heavily recruited from Deerfield Academy, Deerfield, Massachusetts where he spent a post graduate year after Coronado High School outside of San Diego, California. Initially a defensive tackle until UNC Coach Bill Dooley switched him to guard in his second day of practice, he immediately became a starter on the offensive line. As a sophomore, he helped lead the University of North Carolina to an 11-1 Atlantic Coast Conference championship. He played in the 1972 and 1974 Sun Bowls, Hula Bowl, and Senior Bowl in 1975. As a team captain in his senior season, he led an offensive line that produced two 1,000 yard backs and helped Carolina set a school total offense record. He was chosen first Team All-ACC and Consensus All-American in 1974 including Playboy’s Pre-Season All-American pick. Huff was a finalist for the Outland Trophy Award, won the Jacobs Trophy as the league's best blocker, Jim Tatum Medal and was a two time recipient of the Bill Arnold Award as UNC's top lineman. He was also named Captain of the College All-Stars in their game against the Super Bowl Champion Pittsburgh Steelers, selected to the 75th anniversary All Sun Bowl team in 2008, and listed as one of the top 25 lineman to play in the ACC. His number was retired at his high school alma mater and at UNC where his college jersey is hanging on the University's Honored Jersey section of Kenan Memorial Stadium.
1