According to the PMBOK® Guide (Project Cost Management), the Cost Management Plan is a component of the project management plan that describes how the project costs will be planned, structured, and controlled. The specific items listed in the question are foundational elements defined during the Plan Cost Management process to ensure consistency and control throughout the project life cycle.

Units of measure: Defines the units used for each resource (e.g., staff hours, staff days, or a lump sum).

Level of precision: The degree to which cost estimates will be rounded up or down (e.g., $100.45 vs. $100), based on the scope of the activities and magnitude of the project.

Level of accuracy: Specifies the acceptable range (e.g., $\pm10\%$) used in determining realistic cost estimates.

Control thresholds: Variance thresholds for monitoring cost performance may be specified to indicate an agreed-upon amount of variation to be allowed before some action needs to be taken.

Rules of performance measurement: Establishes Earned Value Management (EVM) rules, such as the point at which the work is considered complete (e.g., 50/50 rule or 0/100 rule).

Analysis of Distractors:

B. Work performance information: This consists of the performance data collected from various controlling processes, analyzed in context, and integrated. It is an output of controlling, not a plan where standards are established.

C. Quality management plan: While this plan also deals with " accuracy " and " precision " regarding product requirements and process steps, the specific combination of " units of measure " and " control thresholds " in a financial/resource context is unique to the Cost Management Plan.

D. Work breakdown structure (WBS): The WBS is a hierarchical decomposition of the total scope of work. It provides the framework for the cost management plan (via control accounts), but it does not contain the rules for measurement or precision levels itself.