A compensating control is a control that is implemented to reduce the risk exposure when the primary control is not feasible or cost-effective. A compensating control may not directly address the root cause of the risk, but it can provide an alternative or supplementary way of mitigating the risk. A residual risk is the risk that remains after the risk response has been implemented. A residual risk can be accepted, monitored, or further reduced depending on the risk tolerance and appetite of the organization. During a risk assessment, a risk practitioner is a person who is responsible for identifying and analyzing the potential sources and consequences of risk events. When a risk practitioner learns that an IT risk factor is adequately mitigated by compensating controls in an associated business process, the action that would enable the most effective management of the residual risk is to schedule periodic reviews of the compensating controls' effectiveness, which means to measure and evaluate the performance and compliance of the compensating controls on a regular basis. By scheduling periodic reviews of the compensating controls' effectiveness, the risk practitioner can ensure that the compensating controls are still operating as intended, and that they are delivering the expected results. The risk practitioner can also identify any gaps or weaknesses in the compensating controls, and recommend any improvements or adjustments as needed. References = CRISC Review Manual, 7th Edition, page 177.

A risk register is a document that contains information about potential cybersecurity risks that could threaten a project's success, or even the business itself2. Therefore, it is important to protect the confidentiality and integrity of the risk register from unauthorized or inappropriate access, modification, or disclosure. One way to do this is to implement role-based access, which is a method of restricting access to the risk register based on the roles or responsibilities of the users1. This way, only authorized users who need to view or edit the risk register for legitimate purposes can do so, and the access rights can be revoked or modified as needed. This would most effectively reduce the potential for inappropriate exposure of vulnerabilities documented in the risk register. The other options are not as effective or feasible as option C, as they do not address the need to balance the security and availability of the risk register. Option A, limiting access to senior management only, would compromise the availability and usefulness of the risk register, as other stakeholders such as project managers, risk owners, or auditors may need to access the risk register for risk identification, analysis, response, or monitoring purposes3. Option B, encrypting the risk register, would enhance the security of the risk register, but it would not prevent authorized users from exposing the vulnerabilities to unauthorized parties, either intentionally or unintentionally. Encryption also adds complexity and cost to the risk register management process, and may affect the performance or usability of the risk register4. Option D, requiring users to sign a confidentiality agreement, would rely on the compliance and ethics of the users, but it would not prevent or detect any breaches of the agreement. A confidentiality agreement also does not specify the access rights or roles of the users, and may not be legally enforceable in some cases5.

A cost-benefit analysis is a tool that compares the costs and benefits of different alternatives, such as updating software or continuing to use end-of-life software. A cost-benefit analysis can provide the mosthelpful information to justify investing in updated software, as it can show the potential savings, benefits, and risks of each option, and help the decision-makers choose the best course of action. A cost-benefit analysis can also include qualitative factors, such as security, compliance, performance, and customer satisfaction, that may be affected by the software update. References = ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, Question 231. CRISC by Isaca Actual Free Exam Q&As, Question 8. CRISC: Certified in Risk & Information Systems Control Sample Questions, Question 231. CRISC Certified in Risk and Information Systems Control - Question231.

The risk of terminated employee accounts maintaining access is that the former employees or unauthorized parties may use the accounts to access or manipulate the organization's information systems or resources, and cause harm or damage to the organization and its stakeholders, such as data loss, data breach, system failure, fraud, etc.
The first step to address the risk of terminated employee accounts maintaining access is to disable user access, which means to revoke or remove the permissions or privileges that allow the accounts to access or use the organization's information systems or resources. Disabling user access can help the organization to address the risk by providing the following benefits:
It can prevent or stop the former employees or unauthorized parties from accessing or using the organization's information systems or resources, and reduce or eliminate the potential harm or damage that they may cause for the organization and its stakeholders.
It can ensure the confidentiality, integrity, availability, and reliability of the organization's information systems or resources, and protect them from unauthorized access or manipulation.
It can provide useful evidence and records for the verification and validation of the organization's access control function, and for the compliance with the organization's access control policies and standards.
The other options are not the first steps to address the risk of terminated employee accounts maintaining access, because they do not provide the same level of urgency and effectiveness that disabling user access provides, and they may not be sufficient or appropriate to address the risk.
Performing a risk assessment is a process of measuring and comparing the likelihood and impact of various risk scenarios, and prioritizing them based on their significance and urgency. Performing a risk assessment can help the organization to understand and document the risk of terminated employee accounts maintaining access, but it is not the first step to address the risk, because it does not prevent or stop the former employees or unauthorized parties from accessing or using the organization's information systems or resources, and it may not be timely or feasible to perform a risk assessment before disabling user access.
Developing an access control policy is a process of defining and describing the rules or guidelines that specify the expectations and requirements for the organization's access control function, such as who can access what, when, how, and why. Developing an access control policy can help the organization to establish and communicate the boundaries and objectives for the organization's access control function, but it is not the first step to address the risk, because it does not prevent or stop the former employees or unauthorized parties from accessing or using the organization's information systems or resources, and it may not be relevant or applicable to the existing or emerging risk scenarios that may affect the organization's access control function.
Performing a root cause analysis is a process of identifying and understanding the underlying or fundamental causes or factors that contribute to or result in a problem or incident that has occurred or may occur in the organization. Performing a root cause analysis can help the organization to address and correct the risk of terminated employee accounts maintaining access, and prevent or reduce its recurrence or impact, but it is not the first step to address the risk, because it does not prevent or stop the former employees or unauthorized parties from accessing or using the organization's information systems or resources, and it may not be timely or feasible to perform a root cause analysis before disabling user access. References = ISACA, CRISC Review Manual, 7th Edition, 2022, pp. 40-41, 47-48, 54-55, 58-59, 62-63 ISACA, CRISC Review Questions, Answers & Explanations Database, 2022, QID 207 CRISC Practice Quiz and Exam Prep