Credentialed vulnerability scans allow the scanner to log into systems and retrieve accurate information about installed patches and configurations. If the reports do not reflect current patching levels, it is likely that the scan is being performed without credentials, leading to incomplete or inaccurate results.
* Option A (Updating the scanning engine) ensures the tool has the latest detection capabilities but does not directly affect scan accuracy for missing patches.
* Option B (Centralized patching) helps maintain consistency but does not correct reporting errors.
* Option D (Resetting plug-ins) may be useful if plug-ins are outdated, but the primary issue is lack of privileged access during scanning.
Thus, C is the correct answer, as credentialed scans provide more accurate vulnerability assessments.