Which directory contains configuration files generated at system installation?

The directory that contains configuration files generated at system installation is "/etc/modprobe.d". This directory is specifically used for storing configuration files related to the Linux kernel module loading process. During the installation of a Linux system, various settings and parameters may be defined to control how kernel modules are handled, and these configurations are often stored as individual files within the "/etc/modprobe.d" directory.

The "/etc" directory is a standard location for system-wide configuration files in UNIX and Linux systems. In contrast, other directories listed have different purposes: /lib/configs typically does not exist in standard Linux distributions, /usr/local/etc is used for configuration files that are specific to software installed in the /usr/local hierarchy, and /var/config is not a standard location for configuration files in most Linux systems. Therefore, "/etc/modprobe.d" is the most appropriate answer for identifying where installation-generated configuration files are stored.