Detailed Explanation:The Recovery Point Objective (RPO) specifies the maximum tolerable period in which data might be lost due to an incident. In this case, the organization is indicating that it cannot afford to lose more than three hours of data, defining its RPO.

The strongest evidence to support a risk response decision is a memo indicating risk acceptance. A memo is a formal and written document that can clearly communicate the rationale, criteria, and approval of the risk acceptance decision. Verbal majority acceptance of risk by committee, list of compensating controls, and IT audit follow-up responses are weaker evidence, as they may not be documented, verified, or aligned with the risk response decision. References = ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, question 11; CRISC Review Manual, 6th Edition, page 144.

The best metric to demonstrate that servers are configured securely is the total number of servers meeting the baseline for hardening. Hardening is the process of applying security configurations and settings to servers to reduce their attack surface and vulnerability. A baseline is a standard or benchmark that defines the minimum level of security required for servers. By measuring the number of servers that meet the baseline, the organization can assess the effectiveness of its hardening efforts and identify any gaps or deviations. The other metrics, such as exceeding availability thresholds, experiencing hardware failures, or exceeding current patching standards, are not directly related to the security configuration of servers, but rather to their performance, reliability, or maintenance. References = Risk and Information Systems Control Study Manual, Chapter 2, Section 2.3.2, page 2-25.

The next step after determining that a key control does not meet design expectations is to document the finding in the risk register, because this helps to record and track the information about the identified risk, such as its description, likelihood, impact, response, and status. A key control is a control that addresses a significant risk or supports a critical business process or objective. A control design expectation is a criterion or requirement that defines how the control should operate or perform to achieve its objective. If a key control does not meet its design expectation, it means that there is a gap, weakness, or deficiency in the control that may compromise its effectiveness or efficiency, and increase the risk exposure or impact. By documenting the finding in the risk register, the risk practitioner can communicate and report the risk issue to the relevant stakeholders, such as the risk owner, the management, or the auditor, and initiate the appropriate risk response actions, such as modifying the design of the control, implementing a compensating control, or accepting the risk. The other options are not the best next steps after determining that a key control does not meet design expectations. Invoking the incident response plan is a reactive measure that is triggered when a risk event occurs or is imminent, and requires immediate action to contain, mitigate, or recover from the incident.
However, in this case, the risk event has not occurred yet, and there may be time to prevent or reduce it by improving the control design. Re-evaluating key risk indicators is a monitoring activity that measures and evaluates the level and impact of risks, and provides timely signals that something may be going wrong or needs urgent attention. However, in this case, the risk practitioner has already identified the risk issue, and needs to document and address it, rather than re-evaluate it. Modifying the design of the control is a possible risk response action that may be taken to improve the control and reduce the risk, but it is not the next step after determining that the key control does not meet design expectations. The next step is to document the finding in the risk register, and then decide on the best risk response action, which may or may not be modifying the design of the control, depending on the cost-benefit analysis, the risk assessment, and the risk response strategy. References = Risk IT Framework, ISACA, 2022, p. 13

According to the CRISC Review Manual (Digital Version), the next course of action when an organization has determined a risk scenario is outside the defined risk tolerance level is to identify risk responses, which are the actions or measures taken to address the risk. Identifying risk responses helps to:
* Reduce the likelihood and/or impact of the risk to an acceptable level
* Align the risk response with the organization's risk appetite and risk tolerance
* Optimize the value and benefits of the risk response
* Balance the costs and efforts of the risk response with the potential losses or damages caused by the risk
* Coordinate and communicate the risk response with the relevant stakeholders References = CRISC Review Manual (Digital Version), Chapter 3: IT Risk Response, Section 3.2: Risk Response Process, pp. 161-1621