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CISM study material · question 676 of 1000
What distinguishes observational data in NIST's account of measurement?
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Answer: D. It is captured through observation of activity or behaviour without the direct involvement of the subject
SP 800-55v1 defines observational data as capturing data through the observation of an activity or behaviour without the direct involvement of the subject, giving log management tools collecting network activity as its example.
Source: NIST SP 800-55 Vol. 1 (NIST) — Sec. 2.1 Measurement and Quantitative Assessment