Conducting social engineering testing is the best way to assess the effectiveness of the security awareness training, as it helps to measure and evaluate the actual behavior and response of the employees to simulated real-world attacks that exploit human vulnerabilities. Social engineering testing is a type of security testing that involves performing authorized and ethical hacking activities on the employees to manipulate them into revealing sensitive information, such as credentials, or performing malicious actions, suchas clicking on a phishing link or opening a malicious attachment. Social engineering testing can help to assess the effectiveness of the security awareness training by providing the following benefits:

It tests the employees’ knowledge and skills in recognizing and resisting social engineering attacks, such as phishing, vishing, baiting, or impersonation.

It identifies and measures the strengths and weaknesses of the employees’ security awareness and behavior, and the impact and severity of their actions on the security posture and risk exposure of the organization.

It provides feedback and learning opportunities for the employees to improve their security awareness and behavior, and to reinforce the key concepts and practices taught in the training.

It communicates and reports the results and findings of the testing to the management and the stakeholders, and supports the development and implementation of corrective or preventive actions.

The other options are not the best ways to assess the effectiveness of the security awareness training. Auditing security awareness training materials is a good practice to ensure that the training content is accurate, relevant, and up-to-date, but it does not measure or evaluate the employees’ security awareness and behavior. Administering an end-of-training quiz is a useful method to test the employees’ comprehension and retention of the training content, but it does not reflect or simulate the employees’ security awareness and behavior in real-world situations. Performing a vulnerability assessment is an important step to identify and analyze the potential vulnerabilities in the systems and software, but it does not assess or address the human vulnerabilities or the employees’ security awareness and behavior. References = 3 ways to assess the effectiveness of security awareness training …, IT Risk Resources | ISACA, Measuring the Effectiveness of Security Awareness Training - Hut Six