Which of the following can be used as a quality metric when performing quality planning?

Quality control is a process of monitoring specific project results to verify compliance with quality standards, rather than a metric for initial planning.

Cost benefit analysis is a tool and technique used during quality planning to compare the financial costs of implementing quality activities against their potential benefits, thus helping determine which quality standards and processes are economically viable and should be adopted. It helps in making informed decisions about quality investments and defining measurable quality objectives.

Performing preventative actions is a response to avoid future quality issues, not a metric used to plan quality upfront.

Quality assurance is the process of auditing quality requirements and results to ensure appropriate quality standards are being followed, not a direct planning metric.