What type of connectors does an Attachment Unit Interface use?

The Attachment Unit Interface (AUI) primarily uses 15-pin connectors. This specification allows for a standardized interface between a computer's network interface card (NIC) and a transceiver, enabling the connection to various physical media, such as coaxial cables or fiber-optic links. The 15-pin connector facilitates the communication by housing various signal lines necessary for data transmission as well as control signals.

The other options represent pin counts that are characteristic of different types of connectors for various applications. For example, 8-pin connectors are often found in telephone and some digital applications, while 25-pin connectors are typically associated with parallel ports or video connections, and 30-pin connectors might be used in specific proprietary applications or older devices. However, none of these alternatives are relevant for the AUI standard, which is firmly established as using a 15-pin configuration.