Which command displays all signed certificates on the Puppet master?

The command that correctly displays all signed certificates on the Puppet master is "puppet cert list -a". This command is designed specifically to list all certificates that have been signed by the Puppet master, providing a complete overview of the currently trusted entities, such as agents or nodes.

When using this command, it provides a way to confirm which certificates are active and acknowledged by the Puppet master, which is essential for maintaining security and ensuring that only authorized agents are recognized. The "-a" flag indicates that the command should show all certificates, not just those that are currently valid.

Other options may not convey the intended functionality. For instance, some may reference incorrect commands or may not utilize the appropriate flags to deliver the requested information. Thus, the "puppet cert list -a" command is the most accurate and effective tool for displaying all signed certificates on the Puppet master.