Indian Polity · Polity

Consider the following statements regarding the Basic Structure Doctrine in India: I. It was first propounded by the Supreme Court of India in the landmark Kesavananda Bharati case (1973). II. The doctrine allows Parliament to amend any part of the Constitution, including those features that form its core fundamental identity. III. Prominent jurists and judges have stated that the doctrine acts as a safety valve, preventing Indian democracy from drifting toward authoritarianism or absolutism. IV. The doctrine has been subsequently reaffirmed and applied in cases such as Minerva Mills (1980) and Indira Gandhi v. Raj Narain (1975). How many of the above statements are correct?