Consider the following organisations: I. Atomic Minerals Directorate for Research and Exploration II. Heavy Water Board III. Indian Rare Earths Limited IV. Uranium Corporation of India Which of these is/are under the Department of Atomic Energy?

The correct answer is D because all four listed organizations function under the administrative control of the Department of Atomic Energy DAE. The Atomic Minerals Directorate for Research and Exploration is a constituent unit of DAE responsible for identifying and evaluating mineral resources. The Heavy Water Board is a constituent unit of DAE that manages the production of heavy water used as a moderator and coolant in nuclear reactors. Indian Rare Earths Limited and Uranium Corporation of India are both Public Sector Undertakings PSUs under the Department of Atomic Energy. Indian Rare Earths Limited focuses on beach sand minerals and rare earths, while the Uranium Corporation of India handles the mining and processing of uranium for the countrys nuclear power program.