Shelly is the project manager of the BUF project for her company. In this project Shelly needs to establish some rules to reduce the influence of risk bias during the qualitative risk analysis process. What method can Shelly take to best reduce the influence of risk bias?

A. Establish risk boundaries
B. Group stakeholders according to positive and negative stakeholders and then complete the risk analysis
C. Determine the risk root cause rather than the person identifying the risk events
D. Establish definitions of the level of probability and impact of risk event