The correct option is D (i), (ii), (iii), (iv)
In Keshvananda Bharti's case the Supreme Court explained that Directive Principles and fundamental rights together belonged to the basic structure of the Constitution. However, the Court did not outline the basis of what constituted the basic structure of the Constitution but merely reserved for itself the right to pronounce what constituted the basic structure. Justice Sikri tried to tabulate the basic feature of the Constitution as the supremacy of the Constitution, republican and democratic form of government, secular character, separation of power and federal character.