Which two items does NIST say must be documented alongside each metric? Choose two.

Answer: B. The formula for its calculation and the data source
A. A guide for interpreting the metric's data

SP 800-100 wants each metric backed by how often data is gathered, where it comes from, how it is calculated, what evidences the measured activity, and how the resulting numbers should be read.

Source: NIST SP 800-100 (NIST) — Sec. 7.3 Metrics Development Process