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The command used to change the ownership of a file in RHEL is "chown." This command allows users to modify the user and/or group ownership of a specified file or directory. The general syntax of the command is `chown [options] [new_owner][:new_group] file`, where you can specify a new owner, an optional new group, and the target file or directory whose ownership you want to change.

For instance, using `chown user1:group1 /path/to/file` would change the ownership of the file located at `/path/to/file` to user1 and assign it to group1 as well. The ability to change file ownership is an essential function in managing file permissions and security on a Linux system, ensuring that only authorized users have control over specific files.

The other options provided do not correspond to valid commands in RHEL for changing file ownership. Understanding the correct usage of "chown" is crucial for effective file management and administration in a Red Hat environment.