Which of the following situations best illustrates a "false positive" in the performance of a...

A false positive occurs when a system incorrectly identifies a legitimate item as a threat or an unwanted entity. In the case of a spam filter, a false positive happens when the filter mistakenly classifies a genuine email as spam, even though it is legitimate.

Option A: "The spam filter removed incoming communication that included certain keywords and domains."

This describes a general filtering mechanism but does not indicate a mistake. If the filter was correctly configured, it is not necessarily a false positive. (Incorrect)

Option B: "The spam filter deleted commercial ads automatically, as they were recognized as unwanted."

If the ads were indeed unwanted, this is a true positive, meaning the system worked correctly. (Incorrect)

Option C: "The spam filter routed to the 'junk' folder a newsletter that appeared to include links to fake websites."

If the newsletter contained suspicious links, the filter was functioning as designed. This is not necessarily an error. (Incorrect)

Option D: "The spam filter blocked a fitness club gift card that coworkers sent to an employee for her birthday."

This is a clear example of a false positive because the email was not spam or malicious, yet the filter mistakenly blocked it. (Correct Answer)

IIA GTAG (Global Technology Audit Guide) on Cybersecurity and IT Risks: Discusses false positives and negatives in automated security controls.

IIA’s "Auditing IT Security Controls" Report: Emphasizes the need for tuning security filters to reduce false positives.

COBIT 2019 – DSS05.07 (Manage Security Services): Highlights the importance of minimizing false positives to ensure business communication is not disrupted.

Analysis of Each Option:IIA References:Thus, the correct answer is D. The spam filter blocked a fitness club gift card that coworkers sent to an employee for her birthday.