Consider the following statements regarding constituent assembly:
1. The demand for constituent assembly was finally accepted in principle by British government in Cripps Mission.
2. The constituent assembly was constituted in November 1946 under the scheme formulated by Cabinet Mission plan.
3. The constituent assembly held its first meeting on December 9,1946.The meeting was attended by 211 members.
4. It adopted the national flag on July 22,1947.
How many of the above statements are correct?