To answer this question, we need to understand the concept of security mechanisms. Security mechanisms are measures or techniques implemented to protect computer systems and networks from unauthorized access, attacks, and other potential threats.
Let's go through each option to determine which one is not a security mechanism:
Option A) Defence - This option is a security mechanism. "Defence" refers to the implementation of various measures to protect computer systems and networks, such as firewalls, intrusion detection systems, and encryption.
Option B) Dumpster Diving - This option is not a security mechanism. "Dumpster diving" is a technique used by attackers to gather confidential or sensitive information by searching through trash or discarded materials. It is a form of social engineering and does not involve any protective measures.
Option C) Deterrence - This option is a security mechanism. "Deterrence" refers to the use of preventive measures to discourage potential attackers from targeting a system. This can include visible security cameras, warning signs, or legal consequences for unauthorized access.
Option D) Detection - This option is a security mechanism. "Detection" refers to the process of identifying and alerting about potential security breaches or attacks. This can involve the use of intrusion detection systems, antivirus software, or log monitoring.
Based on the explanations above, the correct answer is B) Dumpster Diving. This option is not a security mechanism as it is a technique used by attackers, rather than a protective measure.