Concept: File security refers to measures that protect computer files from unauthorized access, loss, or damage.Explanation:Common methods of file security include using passwords to restrict access.Making backup copies protects files from being lost or corrupted.Installing anti-virus software protects files from malicious programs.Hacking is an attempt to break into a system without permission.Therefore, hacking is not a security method; it is a threat to file security.Answer: A. hacking