The PRIMARY basis for selecting a security control is the ability to mitigate risk, because it is the measure of how well the control can prevent or reduce the occurrence or impact of the risk, and how effectively the control can achieve the desired level of security and protection for the system and the data. The ability to mitigate risk is the most important criterion for selecting a security control, as it directly relates to the purpose and value of the control. The other options are not the primary basis, because:
* Option A: To achieve the desired level of maturity is a goal of selecting a security control, but not the primary basis. The desired level of maturity is the state or condition of the security control that reflects its quality, consistency, and reliability, and it should be aligned with the organization's security objectives and standards. The desired level of maturity is a result of selecting a security control, not a reason for selecting it.
* Option B: The materiality of the risk is a factor of selecting a security control, but not the primary basis.
The materiality of the risk is the degree or extent of the risk that affects the organization's performance, reputation, and value, and it should be considered when selecting a security control, but it is not the only or the most important factor. The materiality of the risk is an input to selecting a security control, not an output of selecting it.
* Option D: The cost of the control is a constraint of selecting a security control, but not the primary basis. The cost of the control is the amount of resources and expenditure that are required to implement and maintain the control, and it should be balanced with the benefit and effectiveness of the control, but it is not the only or the most important constraint. The cost of the control is a limitation of selecting a security control, not a motivation for selecting it. References = Risk and Information Systems Control Study Manual, 7th Edition, ISACA, 2020, p. 211.

The most important input when developing risk scenarios is the business objectives, as they provide the context and scope for the risk identification and analysis process. Risk scenarios are hypothetical situations that describe the possible causes, events, and consequences of a risk. Risk scenarios help to understand and communicate the nature and impact of the risk, and to support the risk assessment and response planning. The business objectives are the goals and targets that the organization wants to achieve through its processes, functions, and projects. The business objectives define the expected outcomes and performance of the organization, and the criteria for measuring and evaluating the success or failure of the organization. The business objectives also reflect the organization's vision, mission, values, and strategy, and the needs and expectations of the stakeholders. The other options are not the most important inputs when developing risk scenarios, although they may be useful or relevant information. Key performance indicators are metrics that measure and monitor the progress and achievement of the business objectives, but they do not provide the context or scope for the risk scenarios. The organization's risk framework is the set of principles, policies, and processes that guide and support the risk management activities across the organization, but it does not provide the context or scope for the risk scenarios. Risk appetite is the level of risk that the organization is willing to accept or avoid in pursuit of its business objectives, but it does not provide the context or scope for the risk scenarios. References = Risk and Information Systems Control Study Manual, Chapter 2: IT Risk Identification, page 58.

Using a common risk taxonomy is the most important factor to consider when creating a separate IT risk register for a large organization with regard to the existing corporate risk register, as it ensures consistency, clarity, and alignment of the IT risk identification, classification, and reporting with the corporate risk management framework and strategy. Leveraging business risk professionals, relying on generic IT risk scenarios, and describing IT risk in business terms are not the most important factors, as they are more related to the resources, inputs, or outputs of the IT risk register, respectively, rather than the structure or format of the IT risk register. References = CRISC Review Manual, 7th Edition, page 100.

Personal data is any information that relates to an identified or identifiable individual, such as name, address, email, phone number, etc. Processing personal data involves collecting, storing, using, disclosing, or deleting it. Processing personal data poses various risks to the privacy and security of the data subjects, such as unauthorized access, disclosure, modification, or loss. Therefore, processing personal data requires appropriate technical and organizational measures to safeguard the data and to comply with the relevant laws and regulations. One of the most effective practices to safeguard the processing of personal data is to use tokenization. Tokenization is a technique that replaces sensitive data elements with non-sensitive equivalents, called tokens, that have no meaning or value outside of a specific system or context. Tokenization reduces the risk of exposing personal data to unauthorized parties, as the tokens cannot be reversed or linked back to the original data without the proper key or algorithm. Tokenization also helps to minimize the amount of personal data that is stored or transmitted, and to limit the scope of compliance requirements. References = Risk and Information Systems Control Study Manual, Chapter 4, Section 4.3.2.2, p. 196-197

Maturity Models:
* Maturity models provide a framework for assessing the development and optimization of processes within an organization.
* They typically range from ad hoc and immature processes to well-defined and continuously improving processes.
Assessing IT Process Improvement:
* Changes in the organization's position within a maturity model indicate that processes are becoming more mature, standardized, and optimized.
* Improvements in maturity levels reflect enhancements in process efficiency, effectiveness, and consistency.
Importance of Maturity Models:
* Provides a clear and structured approach to evaluate and benchmark process improvements.
* Helps senior management understand the progress and development of IT processes over time.
Comparing Other Indicators:
* Number of Security Exceptions: Useful for identifying issues but not a comprehensive measure of process improvement.
* Risk Register Changes: Reflects risk management activities but not overall process maturity.
* Number of Intrusions Detected: Indicates security effectiveness but not broader process improvements.
References:
* The CRISC Review Manual discusses the use of maturity models to assess and improve risk management capabilities and IT processes (CRISC Review Manual, Chapter 3: Risk Response and Mitigation, Section 3.6 Capability Maturity Models).