An analyst is conducting threat intelligence analysis in a client organization, and during the
information gathering process, he gathered information from the publicly available sources and
analyzed to obtain a rich useful form of intelligence. The information source that he used is primarily
used for national security, law enforcement, and for collecting intelligence required for business or
strategic decision making.
Which of the following sources of intelligence did the analyst use to collect information?
C
Don't let ISAC throw you off. The question is asking about "sources of intelligence" not "sources of information".
OSINT is the correct answer.