Which of the following best describes the implementation of physical trunks?

The implementation of physical trunks is best described by the fact that they require specific hardware installations. Physical trunks are actual connections that facilitate the transmission of voice and data between different points in a telecommunications network. These connections often involve dedicated physical lines, such as copper or fiber optic cables, which necessitate the installation of specific hardware components like switches, routers, and telecommunications interfaces to establish and manage these connections.

In contrast, the other options refer to different characteristics that do not pertain to the nature of physical trunks. For example, while some elements of telecommunications may allow for software-defined configurations, physical trunks are fundamentally reliant on tangible hardware installations. This distinct requirement highlights the importance of understanding the infrastructure needed for establishing reliable communications in a network.