Which of the following is not a man-made threat?

Tidal waves (tsunamis) are geophysical events caused by seismic or volcanic activity beneath the ocean - they originate entirely from natural forces with no human causation. In IT risk management and business continuity planning, threats are categorized as natural (floods, earthquakes, tidal waves) versus man-made (intentional or accidental human actions). This distinction drives different mitigation strategies such as geographic redundancy versus access controls.

Vandalism is a deliberate man-made act in which a person intentionally damages or destroys physical or digital assets.

Terrorism involves intentional violence or sabotage carried out by individuals or groups to cause harm, making it an explicitly man-made threat.

Theft is a human-initiated action involving the unauthorized taking of physical or digital assets and is classified as a man-made threat.