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Can't confirm in my books but this seems to fortify your and idolL's thoughts:
"A false positive might occur when the scanner can read only the configuration information from service banners. For example, a scanner that reads an Apache banner can detect that only version 2.2.15 is installed from the HTTP banner, even when version 2.2.15-39 is also installed and that the version contains a software fix that was backported. " https://www.ibm.com/support/knowledgecenter/en/SSKMKU/com.ibm.qradar.doc/c_qvm_false_positive_vulns.html
Answer is D . they ask what could return false positive , well from all answers "The hosts are evaluated based on an OS-specific profile.". If you run OS specific VS against OS which does not match, what would you expect to happen.
The given answer is correct. The computer clock/time is out of sync with the NTP/server protocol. So, Yes the vulnerability does not exist at that time for that node. Reboot the computer so that the clock /time can sync to the correct current time. We had to do this as part of our turnover routine when we were starting and leaving our shifts when I worked as a datacenter tech.
A would be correct if the question were "Which of the following explains why a vulnerability scan might return a false negative?" Not false positive.
False positive = The vulnerability does not exist.
False negative = The vulnerability exists, but not detected.
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