Which of the following is the MOST significant difference between intrusive and non-intrusive vulnerability scanning?

Which of the following is the MOST significant difference between intrusive and non-intrusive vulnerability scanning?
A . One uses credentials, but the other does not.
B . One has a higher potential for disrupting system operations.
C . One allows systems to activate firewall countermeasures.
D . One returns service banners, including running versions.

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Answer: B