Explanation:

Third option is correct regarding statement of question.
First and Second options are correct. Article 352 of the Indian Constitution that talks about National Emergency is imposed where there is a grave threat to the security of India or any of its territory due to war, external aggression or armed rebellion.
There are three types of emergencies provided in the constitution of India-
An emergency due to war, external aggression or armed rebellion (Article 352); this is popularly known as 'National Emergency'. However, the Constitution employs the expression 'proclamation of emergency' to denote an emergency of this type.
An emergency due to the failure of the constitution machinery in the states (Article 356); this is popularly known as 'President's Rule'. It is also known by two other names- 'State Emergency' or 'Constitutional Emergency'.
Financial Emergency due to a threat to the financial stability or credit of India (Article 360)