Which of the following is not related to information security on the internet?

Information retrieval is about finding and fetching stored information and is not a security measure.

Data encryption protects information by scrambling it so only authorised parties can read it.

Watermarking embeds a hidden mark to prove ownership and detect tampering.

Data hiding conceals information within other data to keep it secret.

The first three defend confidentiality and integrity, while retrieval is merely access.

Retrieval systems like search engines answer queries rather than guard data.