You will be given a definition of a task first, then some input of the task.
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: When was the base Alasdair served as station commander at established? Passage 1:Steedman joined the Royal Air Force in 1942 and served as a pilot during the Second World War. He was appointed Officer Commanding No. 39 Squadron in 1948 and Officer Commanding No. 8 Squadron in 1949. He went on to be Station Commander at Royal Ceylon Air Force Base Katanayake in 1957 and after a tour on the Directing Staff at the Joint Services Staff College from 1960 he became Station Commander at RAF Lyneham in 1962. From 1965 to 1967 he was Chief of the Air Staff of the Royal Malaysian Air Force. He was made Director of Defence Plans (Air) in 1967, Director of the Defence Operations Staff in 1968 and Assistant Chief of the Air Staff (Policy) in 1969. He went on to be Senior Air Staff Officer at Headquarters RAF Strike Command in 1971, Commandant of the RAF Staff College, Bracknell, in 1972 and Air Member for Supply and Organisation in 1976. In October 1977, on promotion to air chief marshal, Steedman took up his last appointment as the UK Military Representative to NATO.
 Passage 2:Black was head hunted and she became a literary agent at Curtis Brown. She played golf and used her connections to find clients that included Somerset Maugham and Samuel Beckett. She was involved with the noted production of Samuel Beckett's Waiting for Godot in 1956 and holidayed with Maugham in France. She notably told John Osborne to "think again" about his play Look Back in Anger that transformed British theatre. Black was fluent in French and so in love with France that she was sometimes called "Noir". She created translations of plays that were enabled not only be her fluency in French but with her knowledge of theatre after reading so many plays as a literary agent. Her translations included Crime Passionel by Jean Paul Sartre. She also translated his play "Morts sans Sépulture" and was thrilled when the director said that it was perfect. In partnership with Michael Flanders, she translated Stravinsky's Histoire du soldat for the Edinburgh Festival. The work played to capacity audiences in Edinburgh, and again in London at the Royal Festival Hall in 1956 with Flanders as the narrator, Sir Ralph Richardson as the Soldier and Peter Ustinov as the Devil. Their translation has held its place as the standard English version into the 21st century.
 Passage 3:Sommer was born in Mouzon, in the Ardennes département of France, into a wealthy Sedan carpet-making family. His father, Roger Sommer, broke the Wright Brothers' record for the longest flight in 1909. It was not until 1931 that Raymond started to display daredevil tendencies of his own, entering motor races in a privateer Chrysler Imperial. The following year, he won the 24 Hours of Le Mans race, despite having to drive over 20 hours solo after his teammate, Luigi Chinetti, retired ill. During the 1930s, Sommer was to dominate the French endurance classic, winning again in 1933 driving an Alfa Romeo alongside Tazio Nuvolari. He also led every race until 1938, only to suffer a mechanical failure, once when 12 laps in the lead. Sommer traveled to Long Island, New York, to compete in the 1936 Vanderbilt Cup where he finished fourth behind the winner, Nuvolari.

Output:
1