Which type of cable is used in an Attachment Unit Interface (AUI)?

The correct answer is that the Attachment Unit Interface (AUI) typically uses 15-pin connectors. The AUI is a standard interface used to connect a computer's network interface card (NIC) to an external transceiver, which is responsible for the physical transmission of data over the network.

The 15-pin connectors are part of the AUI specification, allowing for the transmission of data signals between the NIC and the transceiver. This connector serves both the function of power and data line connections, ensuring reliable communication in the network.

The alternative options do not fit the AUI standard. RJ45 connectors are commonly used in twisted-pair Ethernet cabling but are not applicable to the AUI interface. Fiber optic cables utilize different types of connectors specific to fiber optic standards, and coaxial cable also does not correspond to the AUI connector standard, being used primarily for different networking applications in cable television and data communications. Therefore, the 15-pin connector is unique to the AUI interface, making it the correct choice.