Which type of threat is characterized by a disgruntled employee?

The correct choice pertains to an internal threat. An internal threat is typically posed by individuals or entities that have access to an organization's systems and data, which includes employees, contractors, or business partners. A disgruntled employee can leverage their insider knowledge and access to sensitive information or systems, potentially causing harm to the organization. This threat is particularly impactful because insiders are often familiar with the organization's security measures and can exploit vulnerabilities more easily than an outsider.

In contrast, external opportunistic threats would involve attackers who take advantage of vulnerabilities without prior knowledge of the organization's inner workings. External deliberate threats refer to organized attacks from outside actors, such as hackers or competitors, specifically targeting the organization with malicious intent. Natural disasters, while they can severely disrupt operations, are not driven by individual motivations or malicious actions. Therefore, recognizing the unique characteristics of internal threats is crucial for developing effective security measures and fostering a safer organizational environment.