Name a common type of physical security threat.

The correct answer identifies theft as a common type of physical security threat. This encompasses a range of activities where individuals unlawfully take property or assets, which can occur in various environments, including workplaces, public spaces, and private properties. Theft poses significant risks as it can lead to loss of valuable items, sensitive data breaches, and disruption of operations.

Insider threats also represent a security concern but are more related to individuals within an organization misusing their access, which may not always manifest as physical theft. Cyber attacks and phishing events are generally categorized under cybersecurity threats rather than physical security issues, focusing instead on the digital realm and exploiting vulnerabilities in technology systems or user behavior. Thus, while associated threats are pertinent in their respective categories, theft distinctly stands out as a primary concern directly associated with physical security measures.