Which of the following is an example of an internal threat?

An internal threat refers to a risk that originates from within an organization, potentially compromising information, systems, or operations. Accidental deletion of files fits this definition well, as it typically results from actions taken by employees or system users who may not be aware of the consequences of their actions. Such incidents do not arise from malicious intent but can still lead to significant data loss, impact on productivity, and increased recovery costs.

In contrast, visiting a secure website generally represents a behavior aimed at protecting data rather than posing a threat. Installing antivirus software is a proactive security measure that helps mitigate risks, while properly securing workstations involves protective measures to safeguard systems from threats or unauthorized access. Therefore, accidental deletion clearly exemplifies an internal threat as it is an unintentional action taken by individuals within the organization, leading to the potential compromise of data integrity.