In the Linux distribution Ubuntu, what command would you use to install an application?

The command used to install an application in the Ubuntu Linux distribution is "apt." Advanced Package Tool (APT) is a package management system that handles the installation and removal of software on Debian-based distributions, including Ubuntu.

When you want to install software, you typically use a command such as "sudo apt install [package_name]," which tells the system to use APT with elevated privileges (sudo) to install the specified package. APT connects to repositories — which are servers that host software packages — and manages dependencies, ensuring that all necessary components are installed for the application to run correctly.

Using "apt" simplifies the process of managing software installations and updates, making it a fundamental tool for Ubuntu users. This is in contrast to the other choices, which do not correlate with the package management and installation processes in Linux.