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To change the ownership of a file in RHEL, the command you would typically use is `chown`, which stands for "change owner." This command allows for a straightforward way to specify a new owner for a file.

The syntax for the correct answer includes both the new owner and the group, which is indicated by the format `[owner]:[group]`. This means you can not only change the owner of the file but also assign it to a specific group simultaneously. This is particularly useful in scenarios where file permissions are managed through group memberships, as it allows both user and group assignments in a single command.

Using just the owner (as in the other provided choice) would only change the user ownership, without altering the group. The inclusion of the group designation helps to effectively manage access and permissions in a multi-user environment.

In practical applications, specifying both the owner and the group helps in maintaining proper file security and facilitating collaborative work among users who might belong to the same group. Thus, the use of `chown [owner]:[group] [filename]` offers the flexibility and comprehensiveness needed when managing file ownership in RHEL.