Which manual page describes unit configuration files and their locations?

• A. systemd.conf
• B. systemd.unit
• C. systemd.exec
• D. systemd.service

Answer: (B)

The best fit is the systemd.unit manual page. This page describes the format and meaning of unit configuration files and where systemd looks for them. It covers the common directives that apply to all unit types (like Description, After, Wants, etc.) and clarifies the typical locations where unit files reside, such as /etc/systemd/system for administrator-created units, /usr/lib/systemd/system (or /lib/systemd/system) for distro-provided units, and /run/systemd/system for runtime units. Knowing this page helps you both locate existing unit files and understand how systemd loads and manages units across reboots and reloads. Other options describe different, more specific topics (service-specific directives, execution-related settings), and there isn’t a standard page named systemd.conf for unit-file layout.