Explanations: The chown command (short for "change owner") is specifically used in Linux to assign file or directory ownership to a different user. To include "all the files inside," you must use the -R flag, which stands for recursive, telling the system to apply the change to the directory and everything contained within its subfolders. The other options are incorrect because chmod (Option A) is used to change permissions (like read/write access) rather than ownership, Option C lacks the recursive flag and would only change the directory itself, and usermod (Option D) is used to modify user account settings, not file properties.  B) chown -R backup_admin /data/backups. ✅