The correct answer is to schedule a scan during off-hours and utilize a low sensitivity level because this approach allows for vulnerability assessment with reduced impact on system performance. Scheduling during off-hours ensures that any potential performance degradation happens when the system is least utilized and setting a low sensitivity level reduces the intensity of the scan to prevent potential overloading of system resources. The incorrect answers could either overload the system (full scan during business hours) or may not detect all vulnerabilities (relying on outdated reports).