What parameter is used to display the SELinux Context of one resource?

The parameter that is used to display the SELinux context of a resource is indeed the option "-Z". When you use this option with commands like ls, it appends the SELinux context information next to the file or directory being listed. This context provides crucial information about the security attributes assigned to the resource, which is an essential aspect of SELinux's role-based access control mechanisms.

Using this parameter is vital for system administrators and security professionals who need to make sure that files and processes have the correct contexts, as discrepancies can lead to access issues or security vulnerabilities. In practice, when a user needs to check the SELinux context of files or processes, they will most often run commands that include this "-Z" parameter to ensure they are fully aware of the security settings in place.

The other options do not serve this purpose in the context of SELinux; they either relate to different functionalities or are not associated with displaying security context information.