Consider the following statements with reference to the Emergency provisions in the Constitution:
1. An emergency due to war, external aggression or armed rebellion is known as the Constitutional emergency.
2. The President can declare a national emergency even before the actual occurrence of war or external aggression or armed rebellion.
3. The 42nd Amendment Act of 1976 substituted the word 'armed rebellion' for 'internal disturbance'.
How many statements given above are correct?