Which command will display all installed modules from the Puppet Forge?

The command that displays all installed modules from the Puppet Forge is "puppet module list." This command is specifically designed to show a comprehensive list of all the modules that have been installed on the system using Puppet. It provides critical information, such as the name, version, and any other relevant details about the modules.

This command retrieves data directly from the Puppet environment and reflects the current state of module installation on the system. It's an essential tool for Puppet users to manage and review their installed modules, ensuring that they are aware of what is currently available for use in their Puppet configurations.

The other options do not provide the same functionality. For example, "puppet module show" typically displays details for a specific module rather than listing all installed modules. The other commands either do not exist or do not serve the purpose of listing all installed modules in the manner that "puppet module list" does.