The most effective way to limit the impact of a ransomware attack is to have data backups. Data backups are copies of the data that are stored in a separate location or device, and can be used to restore the data in case of a loss or corruption. Data backups can help to recover the data that is encrypted or deleted by the ransomware, and to avoid paying the ransom to the attackers. Data backups also help to reduce the downtime and disruption caused by the ransomware attack, and to maintain the business continuity and availability of the data. Cyber insurance, cryptocurrency reserve, and end user training are not the most effective ways to limit the impact of a ransomware attack, as they may not prevent or recover the data loss, and may incur additional costs or risks for the enterprise. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 5, Section 5.1.1.1, page 2281
1: ISACA Certified in Risk and Information Systems Control (CRISC) Exam Guide, Answer to Question
657.

Effective risk communication best benefits an organization by helping personnel make better-informed decisions. Risk communication is the process of exchanging information and opinions among stakeholders about the nature, magnitude, significance, or control of a risk. By communicating risk information clearly and consistently, the organization can enhance the understanding and awareness of the risk, and enable the personnel to make decisions that are aligned with the risk appetite and objectives of the organization.
Assisting the development of a risk register, improving the effectiveness of IT controls, and increasing participation in the risk assessment process are other possible benefits, but they are not as important as helping personnel make better-informed decisions. References = ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, question 12; CRISC Review Manual,
6th Edition, page 215.

The primary reason for tracking the status of risk mitigation plans is to ensure that the proposed controls are implemented as scheduled, as this can help to reduce the risk exposure of the organization and to achieve the desired risk objectives. Tracking the status of risk mitigation plans can also help to monitor and evaluate the performance and effectiveness of the risk controls, and to identify and address any issues or gaps that may arise during the implementation. Tracking the status of risk mitigation plans can also provide feedback and information to the risk owners and stakeholders, and enable them to adjust the risk strategy and response actions accordingly. References = CRISC: Certified in Risk & Information Systems Control Sample Questions, Question 251. CRISC Sample Questions 2024, Question 251. ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, Question 251. CRISC by Isaca Actual Free Exam Q&As, Question 9.

The best indication that key risk indicators (KRIs) should be revised is a decrease in the number of critical assets covered by risk thresholds. KRIs are metrics that provide information on the level of exposure to a given risk. Risk thresholds are the predefined values or ranges that indicate the acceptable or unacceptable level of risk exposure. Critical assets are the assets that are essential or vital for the achievement of the objectives or the continuity of the operations. A decrease in the number of critical assets covered by risk thresholds means that the KRIs are not capturing or reflecting the current and relevant risk exposure of the organization, and that they may not provide sufficient or accurate information for risk management decisions.
Therefore, the KRIs should be revised to ensure that they cover all the critical assets and their risk thresholds.
The other options are not as indicative as a decrease in the number of critical assets covered by risk thresholds, as they are related to the outcomes, impacts, or activities of the KRIs, not the scope or quality of the KRIs. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk and Control Monitoring and Reporting, Section 4.2: Key Performance Indicators, page 183.

The standard operating procedure (SOP) statement that best illustrates appropriate risk register maintenance is to remove risk when mitigation results in residual risk within tolerance levels. Residual risk is the risk that remains after the risk response or mitigation has been applied. Tolerance levels are the acceptable or allowable ranges of variation or deviation from the expected or desired outcomes or objectives. When the mitigation results in residual risk within tolerance levels, it means that the risk has been reduced or managed to an acceptable or satisfactory level, and that no further action or monitoring is required. Therefore, the risk can be removed from the risk register, as it is no longer a significant or relevant risk for the organization. The other options are not as appropriate as removing risk when mitigation results in residual risk within tolerance levels, as they are related to the transfer, acceptance, or change of the risk, not the removal of the risk. References = Risk and Information Systems Control Study Manual, Chapter 2: IT Risk Assessment, Section 2.4: IT Risk Response, page 87.