Which of the following is NOT a type of insider fraud threat?

Customer fraud is identified as the correct answer because it involves outside individuals attempting to deceive a business for financial gain, rather than individuals within the organization who have special access or knowledge related to their roles. Insider fraud specifically refers to fraudulent activities carried out by people within the organization, such as employees or management, who exploit their positions to commit fraud.

In contrast, employee level fraud and management level fraud both pertain to unauthorized or dishonest actions taken by current staff, exploiting their access to systems and sensitive information. Vendor fraud also relates to external parties, such as service providers or suppliers, colluding or engaging in deceitful practices against the organization. By understanding the distinction between insider threats and fraud perpetrated by external parties, it becomes clear why customer fraud does not fit into the category of insider fraud threats.