The second question in the “Using Threat Intelligence” Lesson says:
If we receive an alarm from the threat intelligence product we use indicating that an IP address of our organization has been blacklisted. How should we handle the incident?
A- The reason why the IP address is blacklisted should be determined.
B- The reputation should be corrected by contacting the vendor whose IP address is blacklisted.
C- The IP address should be disabled.
D- A search should be made for the server to which the IP address points.
In the lesson itself, regarding the blacklist case, we read:
If it is a blacklist case, we should investigate the root cause and determine on what sources it has been blacklisted.
Reading the latter, I would expect that the correct answer is “A”, but it’s not . Can anyone explain why?