The key performance indicator (KPI) that best measures the effectiveness of an organization's disaster recovery program is the percentage of critical systems recovered within the recovery time objective (RTO).
The RTO is the acceptable timeframe within which a business process or system must be restored after a disruption. The percentage of critical systems recovered within the RTO indicates how well the disaster recovery program can meet the business continuity requirements and minimize the impact of the disruption.
The other options are not as good as the percentage of critical systems recovered within the RTO, as they are related to the efficiency, quality, or scope of the disaster recovery program, not the effectiveness of the disaster recovery program. References = Risk and Information Systems Control Study Manual, Chapter 4:
Risk and Control Monitoring and Reporting, Section 4.2: Key Performance Indicators, page 183.

The most important thing for a risk practitioner to ensure once a risk action plan has been completed is that the risk owner has validated the outcomes, as this means that the risk owner has confirmed that the risk response has been implemented and that the risk level has been reduced to an acceptable level. The risk owner is the person or entity with the authority and responsibility to manage a particular risk, and they should evaluate the effectiveness and efficiency of the risk action plan, and report any issues or changes. The risk action plan is a document that outlines the specific actions, resources, responsibilities, and timelines for implementing a risk response. The other options are not the most important things for a risk practitioner to ensure once a risk action plan has been completed, although they may be useful or necessary steps. Updating the risk register is a good practice, but it should be done after the risk owner has validated the outcomes and with the consent of the risk owner. Mapping the control objectives to the risk objectives is a part of the risk response design, but it does not measure the actual achievement of the risk objectives. Achieving the requirements is a desired result, but it does not guarantee that the risk owner has validated the outcomes or that the risk level has been reduced to an acceptable level. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk Response, page 146.

The primary objective of risk management is to achieve business objectives, as risk management involves identifying, assessing, responding, and monitoring the risks that may affect the desired outcomes and performance of the organization, and aligning them with the risk tolerance and appetite of the organization.
Identifying and analyzing risk, minimizing business disruptions, andidentifying threats and vulnerabilities are not the primary objectives, as they are more related to the process, outcome, or source of risk management, respectively, rather than the purpose or value of risk management. References = CRISC Review Manual, 7th Edition, page 99.

A governance, risk, and compliance (GRC) solution is an integrated system that supports the management of governance, risk, and compliance activities across the enterprise. A GRC solution can provide benefits such as improved efficiency, consistency, transparency, and accountability. The best justification to invest in the development of a GRC solution is to facilitate risk-aware decision making by stakeholders. By providing a holistic view of the enterprise's risk profile, a GRC solution can enable stakeholders to make informed decisions that are aligned with the enterprise's objectives, risk appetite, and tolerance. A GRC solution can also help to monitor and report on the performance and outcomes of the risk management program, and provide feedback and assurance to the board of directors and senior management. The other options are not as compelling as the facilitation of risk-aware decision making, as they may not directly contribute to the achievement of the enterprise's objectives or the management of its risks. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 1, Section 1.1.2.1, pp. 12-13.

Quantum computing threatens outdated algorithms and key lengths. The biggest concern is stale encryption standards-they directly relate to cryptographic resilience. ISACA materials underscore that encryption evaluation is foundational in emerging-threat risk assessments.