During user acceptance testing a defect is found that may seriously affect system performance, and the team says it threatens the delivery date. Which risk management process should be performed?

The correct answer is Plan Risk Responses because a significant defect threatening the delivery date requires immediate action to develop strategies for addressing it. This process involves identifying options and actions to enhance opportunities and reduce threats to project objectives. Perform Qualitative Risk Analysis would be done earlier to prioritize risks, but the impact is already known to be serious. Monitor Risks is an ongoing process, but at this stage, the focus is on developing a response, not just monitoring. Perform Quantitative Risk Analysis would quantify the financial or schedule impact, which might be part of understanding the risk, but the primary need here is to plan how to deal with the identified threat.