The correct answer is 1,2 and 3. Important Points NATIONAL EMERGENCY ​Grounds of Declaration Under Article 352, the President can declare a national emergency when the security of India or a part of it is threatened by war or external aggression or armed rebellion. It may be noted that the president can declare a national emergency even before the actual occurrence of war or external aggression or armed rebellion if he is satisfied that there is an imminent danger. Hence, statement 3 is correct. ​A proclamation of national emergency may be applicable to the entire country or only a part of it. The 42nd Amendment Act of 1976 enabled the president to limit the operation of a National Emergency to a specified part of India. Hence, statement 1 is correct. The President, however, can proclaim a national emergency only after receiving a written recommendation from the cabinet. This means that the emergency can be declared only on the concurrence of the cabinet and not merely on the advice of the prime minister. Hence, statement 2 is correct. The proclamation of Emergency must be approved by both the Houses of Parliament within one month from the date of its issue. A proclamation of emergency may be revoked by the President at any time by a subsequent proclamation. Such a proclamation does not require parliamentary approval. Further, the President must revoke a proclamation if the Lok Sabha passes a resolution disapproving its continuation. ​Additional Information ​When a national emergency is declared on the ground of ‘war’ or ‘external aggression’, it is known as ‘External Emergency’. On the other hand, when it is declared on the ground of ‘armed rebellion’, it is known as ‘Internal Emergency’. Originally, the Constitution mentioned ‘internal disturbance’ as the third ground for the proclamation of a National Emergency, but the expression was too vague and had a wider connotation. Hence, the 44th Amendment Act of 1978 substituted the words ‘armed rebellion’ for ‘internal disturbance’. Thus, it is no longer possible to declare a National Emergency on the ground of ‘internal disturbance’ as was done in 1975 by the Congress government headed by Indira Gandhi.