You read in the newspapers that the ex-employee of a large company systematically deleted files out of revenge on his manager. Recovering these files caused great losses in time and money.
What is this kind of threat called?

A.
Human threat

B.
Natural threat

C.
Social Engineering

Explanation:
Intentional human threat.
People can intentionally cause damage to information systems for various reasons. We usually think of outsiders such as a hacker who has something against a company and wishes to break into it and cause it damage.
However, what about a company employee who destroys company data after being dismissed, or who, not getting the promotion he or she wanted, takes revenge by destroying data or selling it to the competition.