The following are the methods of file security except

File security refers to the deliberate measures put in place to protect stored data from loss, corruption, or unauthorised access. Genuine file-security methods include restricting access with a password, keeping duplicate copies through backup so data can be recovered if the original is damaged, and running anti-virus software to detect and remove malicious programs that could destroy or steal data.

Hacking is the opposite of a security method. It is the unauthorised act of breaking into a computer system to access, alter, or steal data, which is precisely the threat that passwords, backups, and anti-virus software are designed to guard against. Because it attacks file security rather than protecting it, hacking cannot be classed alongside the other three items.

When a question asks which item does not belong with a set of protective measures, check whether that item is itself a threat rather than a defence; a threat can never be listed as a security method.