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 A control is a measure or action that is implemented to reduce the likelihood or impact of a risk event, or to enhance the benefits or opportunities of a risk event. A control owner is a person who is assigned the responsibility and authority for the design, implementation, operation, and maintenance of a control. The most appropriate person to be assigned ownership of a control is the individual accountable for monitoring control effectiveness, which is the process of measuring and evaluating the performance and compliance of the control. By assigning the control ownership to the individual accountable for monitoring control effectiveness, the organization can ensure that the control is aligned with the risk objectives, operates as intended, and delivers the expected results. References = 4

The risk practitioner’s most important action related to the decision to commit to a business activity with the knowledge that the risk exposure is higher than the risk appetite is to document formal acceptance of the risk. Formal acceptance of the risk means that the organization acknowledges and agrees to bear the risk and its potential consequences. Formal acceptance of the risk should be documented and approved by the appropriate authority level, such as senior management or the board of directors. Formal acceptance of the risk should also include the rationale, assumptions, and conditions for accepting the risk, as well as the monitoring and reporting mechanisms for the risk. Formal acceptance of the risk provides evidence and accountability for the risk management decision and helps to avoid disputes or misunderstandings in the future. The other options are not as important as documenting formal acceptance of the risk, as they are related to the alternatives, adjustments, or rejections of the risk, not the actual acceptance of the risk. References = Risk and Information Systems Control Study Manual, Chapter 3: IT Risk Response, Section 3.2: IT Risk Response Options, page 133.

 Risk tolerance is the best term to describe the situation where an organization has agreed to a 99% availability for its online services and will not accept availability that falls below 98.5%. Risk tolerance is the amount and type of risk that an organization is willing to accept in order to achieve its objectives. Risk tolerance defines the acceptable variation in outcomes related to specific performance measures, such as availability, reliability, or security. Risk tolerance is usually expressed as a range, such as 99% +/- 0.5%. Risk mitigation, risk evaluation, and risk appetite are not the correct terms to describe this situation, because they refer to different aspects of risk management, such as reducing, assessing, or pursuing risk, respectively. References = Risk and Information Systems Control Study Manual, Chapter 1, Section 1.2.1, page 1-8.

 The control owner should be responsible for evaluating the residual risk after a compensating control has been implemented. A compensating control is a control that provides an alternative or additional measure of protection when the primary or preferred control is not feasible or effective. A residual risk is the risk that remains after the risk response or mitigation has beenapplied. The control owner is the person who has the authority and responsibility for designing, implementing, and monitoring the controls that enforce the policy. The control owner can assess the impact and effectiveness of the compensating control on the residual risk, and report the results and recommendations to the risk owner or the risk practitioner. The other options are not as responsible as the control owner, as they are related to the compliance, ownership, or management of the risk, not the evaluation of the control. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk and Control Monitoring and Reporting, Section 4.4: Key Control Indicators, page 211.