Which connector is used for IDE and PATA hard disks, CDs, and DVD drives?

The Molex connector is the correct choice for IDE and PATA hard disks, CDs, and DVD drives. This connector is a type of power connector that has been standard in computer systems for many years, particularly for powering older hard drives and optical drives (like CD and DVD drives) that utilize the IDE (Integrated Drive Electronics) or PATA (Parallel ATA) interface.

The Molex connector typically has four pins, which provide the necessary power (typically +12V and +5V) required by these devices. The other choices listed do not serve the same purpose in relation to powering or connecting IDE and PATA drives.

For instance, the USB connector is mainly used for data transfer and connecting external devices, not typically for internal drive connections like those of IDE or PATA drives. SATA connectors, on the other hand, are used for newer storage solutions using the SATA interface, which has largely replaced IDE/PATA drives. Lastly, the Ethernet connector is used for networking purposes and has no role in connecting storage drives.

Thus, the Molex connector’s specific functionality in providing power to older hard disk drives and optical drives makes it the correct answer.