Sophos Certified Engineer Practice Exam

The correct answer is the administrator password. In securing a Mac client, the administrator password is crucial as it grants access to system-level settings and permissions that are necessary for implementing security measures. This includes configuring system preferences, installing security updates, managing user accounts, and setting up security applications. Without the administrator password, it would be impossible to enforce security protocols or make necessary adjustments to ensure the device's compliance with organizational security policies. While the administrator email, network credentials, and security question answers hold some importance in various contexts, they do not directly facilitate the control required for comprehensive security management as the administrator password does. Therefore, the administrator password stands out as the key piece of information necessary for securing a Mac client effectively.