After installing a new package, in which directory are you most likely find its configuration file?

`/lib` is designated for essential shared libraries and kernel modules, not configuration files.

`/conf` is not a standard directory in the Linux Filesystem Hierarchy Standard and does not conventionally exist on Linux systems.

The Filesystem Hierarchy Standard (FHS) designates `/etc` as the directory for host-specific, system-wide configuration files. When a package is installed, its configuration files are almost always placed in `/etc` or a subdirectory of it (for example, `/etc/nginx/` or `/etc/ssh/`). This convention is followed consistently across virtually all Linux distributions and package managers.

`/usr` contains user-land programs, libraries, and documentation, but application configuration belongs in `/etc`, not `/usr`.

`/opt` is for self-contained optional or add-on software packages, and while some may include config locally, the FHS-standard location for configuration remains `/etc`.