Answer : 2. "352"
Explanation :

1. The emergency provisions in the Indian Constitution are divided into three parts, which include national emergency (Article-352), failure of constitutional machinery in states/President's rule (Article-356) and financial emergency (Article-360).

2. Articles 352 to 360 in Part XVIII of the Indian Constitution deal with the provisions relating to Emergency.

3. National Emergency can be declared only after a resolution is passed by both the Houses of Parliament.

4. The resolution should contain an express proposal to enable the President to declare a national emergency.