The correct answer is Capacitance.
* Capacitive sensors detect changes in the electromagnetic field around a metallic object. When a metal container enters this field, it alters the capacitance, triggering an alarm or alert.
* Photoelectric sensors rely on light interruption or reflection and are typically used for perimeter detection.
* Sonic and ultrasonic sensors measure sound waves to detect motion or proximity but are not designed to sense metallic objects via electromagnetic fields.
Capacitive sensing is widely used in security for protecting safes, metal cabinets, and secured storage containers because it provides reliable detection of tampering or unauthorized entry into a defined magnetic field, consistent with ASIS PSP guidance on electronic intrusion detection.

Electronic eavesdropping involves the unauthorized interception or monitoring of digital data and communications, including tapping into communication lines. This can involve accessing private messages, data streams, or other electronic communications as they travel across networks.
War driving (B) refers to searching for unsecured Wi-Fi networks, not line tapping.
Digital beating (C) and Standard digitizing (D) are not recognized cybersecurity terms.
References:
PSP Study Guide - Network Security Threats
ASIS POA Manual - Electronic Surveillance Risks

A non-delegable duty is a legal responsibility that cannot be entirely transferred to another party (such as an independent contractor) under agency law. While a company may hire third-party providers, the courts often hold that certain responsibilities-particularly those involving safety and legal compliance-remain with the hiring entity. This is particularly significant in the context of security services, where liability can still rest with the client company even if services are outsourced.
Delegable duty (B) is the opposite and not applicable in this context.
Non-Crime duty (C) is not a recognized legal term.
References:
ASIS POA Manual - Liability and Contract Law
PSP Study Guide - Legal Obligations in Contracted Security