Which one of the following is not a circumstance for proclamation of Emergency by the President of India under Article 352 of the Constitution of India ?

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. The President can declare a national emergency even before the actual occurrence of war or armed rebellion or external aggression When a national emergency is declared on the grounds of ‘war’ or ‘external aggression’, it is known as ‘External Emergency’. On the other hand, when it is declared on the grounds of ‘armed rebellion’, it is known as ‘Internal Emergency’. The term ‘armed rebellion is inserted from the 44th amendment. Before this term, it was known as an internal disturbance.