The MOST effective way to help ensure an organization's current risk scenarios are relevant is to involve the stakeholders in the risk assessment process, because they are the ones who have the knowledge, experience, and interest in the risk scenarios that affect their domains and objectives. The involvement of stakeholders can help to identify and validate the risk scenarios, to provide input and feedback on the risk analysis and evaluation, and to ensure the alignment and integration of the risk scenarios with the business processes and goals. The other options are not as effective as the involvement of stakeholders, because:
Option A: Adoption of industry best practices is a good way to improve the quality and consistency of the risk scenarios, but it does not ensure their relevance to the organization's specific context and environment.
Industry best practices are general and standardized guidelines that may not reflect the organization's unique risks and needs.
Option C: Review of risk scenarios by independent parties is a useful way to verify and enhance the accuracy and reliability of the risk scenarios, but it does not ensure their relevance to the organization's internal and external stakeholders. Independent parties are objective and impartial reviewers who may not have the same knowledge, experience, and interest as the stakeholders.
Option D: Documentation of potential risk in business cases is a helpful way to communicate and justify the importance and value of the risk scenarios, but it does not ensure their relevance to the organization's current and future state. Business cases are concise and persuasive documents that may not capture all the aspects and dimensions of the risk scenarios. References = Risk and Information Systems Control Study Manual, 7th Edition, ISACA, 2020, p. 104.

An IT risk register is a document that records and tracks the significant IT risks that an organization faces across its various functions, processes, and activities. An IT risk register can help to provide a comprehensive and consistent view of the organization's IT risk profile, and to support the decision making and reporting of the IT risk management function1.
One of the data that must be updated to maintain an IT risk register is the expected frequency and potential impact of each IT risk. The expected frequency is the probability or likelihood of the IT risk occurring, based on historical data, statistical analysis, expert judgment, or other methods. The potential impact is the magnitude or severity of the consequences or outcomes of the IT risk, measured in terms of cost, time, quality, reputation, or other criteria2.
Updating the expected frequency and potential impact of each IT risk is essential for maintaining an IT risk register, because it can help to:
Evaluate and prioritize the IT risks based on their risk level, which is calculated by multiplying the frequency and impact Monitor and track the changes or trends in the IT risk exposure and performance over time Identify and implement the appropriate risk response strategies and controls, based on the risk level and the risk appetite and tolerance of the organization Report and communicate the IT risk status and progress to the stakeholders, using risk indicators, dashboards, or matrices3 The other options are not the data that must be updated to maintain an IT risk register, but rather the data that are used as inputs or outputs of the IT risk management process. Risk tolerance is the acceptable variation in the outcomes related to specific objectives or risks. Risk tolerance is used to measure the IT risk analysis and to guide the IT risk response. Enterprise-wide IT risk assessment is a process that identifies, analyzes, and evaluates the IT risks across theorganization. Enterprise-wide IT risk assessment is used topopulate the IT risk register and to inform the IT risk response. Risk appetite is the amount and type of risk that an organization is willing to accept in order to achieve its objectives. Risk appetite is used to guide the IT risk analysis and to align the IT risk response. References = Risk Register - ISACA Risk Analysis - ISACA Risk Register 2021-2022 - UNECE
[How To Conduct Business Impact Analysis in 8 Easy Steps - G2]
[Risk Appetite and Risk Tolerance - ISACA]
[Enterprise Risk Assessment - ISACA]
[CRISC Review Manual, 7th Edition]

The effectiveness of an employee deprovisioning process can be measured by the number of days taken to remove access after staff separation dates, as this indicates how quickly and completely the organisation can revoke the privileges of former employees and reduce the risk of unauthorized access or data leakage. The number of days taken for IT to remove access after receipt of HR instructions is a measure of the efficiency of the IT department, but not the overall process. The number of termination requests processed per reporting period is a measure of the volume of the process, but not the quality or timeliness. The number of days taken for HR to provide instructions to IT after staff separation dates is a measure of the performance of the HR department, but not the entire process. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk Response, page 152.

Performing scenario-based assessments is a proactive approach that allows organizations to anticipate potential future events and assess their impact. This method helps in identifying emerging risks by exploring hypothetical situations and their possible outcomes. It enables organizations to prepare for unforeseen events by understanding how different scenarios could affect their operations and objectives.
Reference:ISACA CRISC Review Manual, 7th Edition, Chapter 2: IT Risk Assessment, Section: Risk Identification Techniques.

Comparing risk rating against appetite is the most helpful criterion when prioritizing action plans for identified risk, as it helps to determine the urgency and importance of addressing the risk. Risk rating is the level of risk after considering the likelihood and impact of a risk event, and risk appetite is the amount and type of risk that an organization is willing to accept in pursuit of its objectives. By comparing risk rating against appetite, an organization can identify which risks are above, within, or below its tolerance level, and prioritize the action plans accordingly. Risks that are above the appetite level should be treated with the highest priority, as they pose a significant threat to the organization's objectives and performance. Risks that are within the appetite level should be monitored and controlled regularly, as they are acceptable but still require attention. Risks that are below the appetite level should be reviewed periodically, as they are negligible or insignificant.
References:
*ISACA, Risk IT Framework, 2nd Edition, 2019, p. 751
*ISACA, Tips for Prioritizing Risk in Your Risk Register2