Explanation
The correct answer is D: Six Months.
Article 356 of the Indian Constitution allows the President of India to impose President's Rule, also known as State Emergency or Central Rule, in a state in case of failure of constitutional machinery in that state.
Under this article, the President can assume all or any of the functions of the state government and powers vested in the Governor or any other executive authority in the state. The President's Rule can be imposed for a maximum period of six months, and it can be extended for a maximum of three years with the approval of Parliament.
However, if the President's Rule continues for more than six months, then it can be extended only after a review by the President and with the approval of the Parliament. In such a scenario, the President must satisfy themselves that the situation in the state warrants the continuation of the President's Rule.
Thus, the President's Rule under Article 356 remains valid in a state for a period of six months, and it can be extended only after the approval of Parliament.
