The correct answer is option 2: Article 352 of the Indian constitution has the provision for National Emergency. This article empowers the President of India to proclaim a National Emergency in case of a threat to the security of the country, either due to war, external aggression, or armed rebellion. During a National Emergency, the central government gains the authority to exercise powers normally reserved for the states and can take necessary steps to deal with the emergency situation effectively. The proclamation of a National Emergency must be approved by the Parliament within one month, and it can be extended by six-month intervals through parliamentary approval. This provision ensures that the government can take swift actions to protect the nation`s security and integrity in times of crisis.