Explanation: Most modern RADAR transmitters, particularly those using magnetrons or klystrons, require very high *DC* voltages (often tens of thousands of volts, pulsed) to operate their transmitting tubes. While the *input* to the high-voltage power supply might be AC, it is rectified and filtered to produce the necessary high-voltage DC for the radar's output stage. Therefore, statement A, claiming high voltage supplies may produce voltages in excess of 5,000 volts *AC* for the transmitter itself, is generally false for the final output stage of modern radar. Statements B, C, and D are true: B) It's standard practice in complex electronics like radar to have separate supplies for distinct voltage domains (e.g., low voltage for control logic, high voltage for the transmitter tube). C) Modern low-voltage supplies commonly use switching mode power supply (SMPS) technology for efficient generation of multiple regulated DC voltages. D) A low-voltage power supply unit can indeed provide both DC for logic and amplifiers, and low-voltage AC for components like transformer-isolated signals, filament heaters, or specific motor applications.