The correct answer is option 4, President of India. The President of India is constitutionally empowered to alter Scheduled Areas. Scheduled Areas are areas that are inhabited by Scheduled Tribes, and they are given special protections under the constitution. These areas are defined and listed in the Fifth Schedule of the Indian Constitution. If there is a need to alter or modify the boundaries of these Scheduled Areas, it can only be done through a legislation passed by the Parliament of India. The President has the power to give his assent to such a legislation, thereby authorizing the alteration of the Scheduled Areas. It is important to note that this power is vested in the President and not in any of the other options provided in the question.