According to the PMBOK® Guide, the Monitor Risks process involves tracking identified risks, monitoring residual risks, identifying new risks, and evaluating risk process effectiveness throughout the project.

Technical Performance Measurement: This is a specific tool and technique used in monitoring risks. It compares technical accomplishments during project execution to the schedule of technical achievement. It requires the definition of objective, quantifiable measures of technical performance (such as weight, transaction processing time, or number of delivered defects).

The " Warning Signal " : If the technical performance is not meeting the plan (e.g., a software module is taking more memory than allocated), it indicates that a risk (such as failing to meet the final technical requirements) may be occurring or is more likely to occur than previously thought.

Other Tools in Monitor Risks:

Data Analysis: Including Reserve Analysis and Trend Analysis.

Audits: To examine the effectiveness of the risk response processes.

Meetings: Specifically Risk Reviews, which should be scheduled regularly.

Analysis of Other Options:

B. Cost performance baseline: This is an Output of the Determine Budget process and serves as an Input to various monitoring and controlling processes. It is a document, not a tool or technique.

C. Benchmarking: This is a tool and technique typically used in Plan Quality Management or Plan Stakeholder Engagement. It involves comparing actual or planned project practices to those of comparable projects to identify best practices and provide a basis for measuring performance.

D. Cost of quality (COQ): This is a tool and technique used in Plan Quality Management to find the total cost of all efforts to achieve product/service quality. While it relates to risk, it is specifically a quality planning tool.