According to which Article ‘National Emergency may be declared by the president of India?

The President can declare National Emergency on the basis of –

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 ?

Which Article of the Indian Constitution deals with the proclamation of Emergency ?

Which article can't be suspended even during national emergency?

The President of India may declare the National Emergency if there is the threat of: 1. External aggression 2. Internal disturbances 3. Armed rebellion 4. Communal clashes