Which package management tool is used in Red Hat-based Linux systems?

In Red Hat-based Linux systems, the primary package management tool used is the RPM Package Manager, commonly referred to as RPM. This tool allows users to install, uninstall, and manage software packages in a standardized format. RPM operates directly on the package files and is fundamental to the management of packages in distributions like Red Hat Enterprise Linux (RHEL), Fedora, and CentOS.

While YUM (Yellowdog Updater Modified) and DNF (Dandified YUM) are both higher-level package management tools that build upon RPM, they serve different purposes. YUM and DNF provide additional features such as dependency resolution, handling of repositories, and easier management of software packages. However, they still rely on RPM files as the underlying format for the actual software being installed.

APT (Advanced Package Tool) is not applicable here, as it is the package management system used primarily in Debian-based distributions, such as Ubuntu. Therefore, the use of RPM as the foundational tool in managing packages in Red Hat-based systems makes it the correct answer.