Consider the following statements:
1. In India the PM is only a nominal executive and the real powers are vested in the President.
2. The executive power of the Union shall be vested in Prime Minister and shall be exercised by him either directly or through officers subordinates to him.
3. Council of ministers headed by the Prime Minister advices the President with regard to summoning and proroguing of the sessions of the Parliament.
4. Orders and other instruments made and executed in the name of the President shall be authenticated in such manner as may be specified in rules made by the Parliament.
Which of the statements given above is/are incorrect?