Which of the following best describes an RJ45 connector?

An RJ45 connector is best described as an eight-pin, eight-conductor plug and jack that is primarily used for Ethernet networks. It serves as the standard interface for connecting devices such as computers, routers, and switches in local area networks (LANs). The eight conductors correspond to the four twisted pairs of wires found in Ethernet cabling, such as Category 5 (Cat 5) or Category 6 (Cat 6) cables. This configuration allows for high-speed data transmission, making it essential for modern networking applications.

The other options describe different types of connectors that do not align with the characteristics of an RJ45. A four-pin, four-conductor plug is more representative of a telephone connector (often referred to as RJ11), which is distinct from the RJ45 due to having fewer pins and being used in different applications. Coaxial connectors are used for TV signals and are not applicable to Ethernet connectivity. Finally, serial connectors pertain to older computer communication standards and are also unrelated to the RJ45's function. Thus, the characteristics of an RJ45 make it unique in its role within Ethernet networking.