Final answer:
Correct option is 1 ,2 and 3 .Modern PC power supplies generate 3.3V, 5V, and 12V DC voltages, while 120V and 240V are the AC voltages for home outlets in the US and Europe, respectively, and are not produced by PC power supplies.
Step-by-step explanation:
The voltages generated by modern PC power supplies are typically at 3.3V, 5V, and 12V. These are the low-voltage DC (Direct Current) outputs that are used to power different components within a personal computer, such as the motherboard, CPU, RAM, and other peripherals. On the other hand, 120V and 240V are standard AC (Alternating Current) voltages used in homes across the United States and Europe, respectively, but these are not generated by PC power supplies. Instead, the 120V or 240V from the wall outlet gets converted down to the lower DC voltages inside the power supply unit (PSU) for safe use by computer components.