Which of the following best defines an overhead service conductor?

An overhead service conductor is defined as conductors that are suspended above the ground, typically from utility poles or other types of supports. This definition aligns with the common installation methods for electric power distribution systems, where these conductors are elevated to ensure safety, reduce accidental contact, and allow for the passage of vehicles and equipment underneath.

In relation to the other choices, buried conductors do not fit this definition, as they are intended to be installed underground, providing a different method of electrical service delivery. Disconnected power lines refer to lines that are not currently active or carrying electrical current, which does not accurately describe the role or installation of overhead service conductors. A flexible conductor used indoors would typically designate a different type of wiring, often suited for temporary or mobile applications, and not reflective of overhead installations used for permanent service entrances or distribution. Thus, the correct answer encapsulates the accurate characteristics of overhead service conductors in relation to their physical placement and functionality.