Detailed Instructions: 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.
Q: Question: Which unit that were combined to form the Royal Irish Regiment was established first? Passage 1:He attended San Clemente High School in San Clemente, California, where he earned All-Conference, All-County and All-Southern California honors as a senior (1983–84). Then he played collegiately at the City College of San Francisco from 1984 to 1986, where he led his team to the state finals where it was defeated by Sacramento City College. The winning continued when he accepted a scholarship to Indiana University, with whom he won the 1987 NCAA National Championship. He was selected in the second round (38th pick overall) of the 1988 NBA draft by the Phoenix Suns, but did not play in the NBA for eight seasons, playing instead in Europe (in Italy and Greece). Prior to the 1996–97 season he was signed as free agent by the Minnesota Timberwolves, and afterwards played in the NBA for the next five seasons, for the Denver Nuggets (1997–98), Timberwolves again (1998–99 to 2001–02), and Golden State Warriors (2001–02), where he was traded in mid-season. During those six seasons he played in 359 games, and averaged 19.4 minutes, 4.8 points, 5.0 rebounds, and 1.0 blocks per game, with a 0.480 field goal percentage.
 Passage 2:He was Commanding Officer of 1Bn Royal Irish Rangers from February 1989 to August 1991. He attended the Higher Command and Staff Course, graduating in April 1991, and was promoted to colonel on 30 June 1991. From August 1991 to January 1992, he was based in Northern Ireland, overseeing the amalgamation of the Ulster Defence Regiment and the Royal Irish Rangers into the Royal Irish Regiment. He was promoted to brigadier on 31 December 1991, with seniority from 30 June 1991. From January 1992 to November 1993, he was commanding officer of the 48 Gurkha Brigade in Hong Kong. He was posted to the Ministry of Defence from November 1993 until January 1997 as Director of Public Relations (Army).
 Passage 3:On 23 April 1943, the War Office gave permission to raise a second airborne division, the 6th Airborne. The division comprised the 3rd and 5th Parachute Brigades and the 6th Airlanding Brigade, giving it two parachute and one airlanding brigades, which became the standard British complement for an airborne division. In May 1943 Brigadier Hugh Kindersley was appointed as the airlanding brigade's first Commanding Officer (CO). Under his command he had two experienced battalions transferred from the 1st Airlanding Brigade: the 2nd Battalion, Oxfordshire and Buckinghamshire Light Infantry (2nd OBLI) and the 1st Battalion, Royal Ulster Rifles (1st RUR). They were joined by a unit newly transferred to the airborne forces, the 12th Battalion, Devonshire Regiment (12th Devons), a hostilities-only unit formed during the war, as the brigade's third infantry battalion. Other units assigned around the same time were the 53rd (Worcestershire Yeomanry) Airlanding Light Regiment, Royal Artillery, the 249th (Airborne) Field Company, Royal Engineers and the 195th (Airlanding) Field Ambulance, Royal Army Medical Corps.

A:
2