Computer Science for IGCSE & O level - Data Transmission (Section 7 - No. 47)

Which of the following best describes the term 'non-repudiation' in the context of security?

Ensuring data can be read by only the intended recipient.

Preventing a sender from denying they sent a message.

Verifying the integrity of a message.

Protecting a system from unauthorized access.

Non-repudiation means that the sender cannot deny they sent the message.