In India, separation of judiciary from the executive is enjoined by

1. The question asks where the principle of separation of judiciary from the executive is enjoined (mandated or directed) in the Constitution of India. 2. Article 50 of the Constitution, located in Part IV, explicitly states: "The State shall take steps to separate the judiciary from the executive in the public services of the State." 3. Part IV of the Constitution contains the Directive Principles of State Policy (DPSP). 4. Therefore, the separation of judiciary from the executive is enjoined by a Directive Principle of State Policy. 5. Option (A) is incorrect; the Preamble outlines the basic philosophy and objectives but doesn't enjoin this specific separation. 6. Option (C) is incorrect; the Seventh Schedule deals with the division of legislative powers. 7. Option (D) is incorrect; while there might be conventional practices, the principle is explicitly enjoined by the Constitution through a DPSP.