The system administrator is keeping local configuration file changes in RCS. What command will commit the file to RCS revision control AND keep a local, unlocked copy of the latest version of the file

The `ci file` command commits changes but by default removes the working file, unless the `-u` or `-l` option is specified to keep a local copy.

`rcs commit file` is not a standard RCS command for committing files; the correct command for checking in is `ci`.

`rcs o file` is not a standard RCS command. The `rcs` command is generally used for administrative tasks on the RCS control file itself, not for committing working files.

The `ci` command is used to check in (commit) changes to an RCS repository. The `-u` option specifically instructs `ci` to update the working file after the commit by retrieving a new, unlocked version from the repository, allowing the user to continue working with the file.