According to the PMI-RMP Exam Content Outline1, one of the domains of the PMI-RMP certification is risk monitoring and reporting. This domain includes tasks such as "monitor and report on risk metrics and trends",
"monitor the status of risk response activities and update risk register and risk report accordingly", and
"monitor and control project contingency and management reserves". These tasks imply that the risk manager should regularly check and report on the status of risks identified according to their prioritization (B), monitor the status and oversee execution of the risk response plan for each identified risk ©, and ensure management reserves are sufficient to cover the mitigation plans for all identified risks (D). These actions will help the risk manager to ensure the risk management plan remains effective during the project timeframe. Therefore, the best answers are B, C, and D.
References: 1: PMI-RMP Exam Content Outline, pages 9-10.