A key performance indicator (KPI) is a metric that reflects how well an organization is achieving its goals and objectives. A KPI should be specific, measurable, achievable, relevant, and time-bound. For an IT department that has organized training sessions to improve user awareness of organizational information security policies, the best KPI to reflect the effectiveness of the training is the percentage of staff members who complete the training with a passing score. This KPI measures the level of knowledge and understanding of the security policies among the staff members, as well as the quality and impact of the training sessions. It also indicates whether the training sessions have met the predefined criteria and standards for success. A high percentage of staff members who complete the training with a passing score implies that the training sessions have been effective in improving user awareness of organizational information security policies. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.3.2, p. 117-118

The data privacy officer is the best person to notify in case of a new malware that has severely impacted industry peers with data loss. The data privacy officer is responsible for ensuring that the enterprise complies with the applicable privacy laws and regulations, and that the personal data of the customers, employees, and other stakeholders are protected from unauthorized access, use, disclosure, or destruction. The data privacy officer can assess the potential impact of the malware on the enterprise's data privacy obligations and risks, and coordinate the appropriate response and remediation actions. The customer database manager, the customer data custodian, and the audit committee are not the best persons to notify, as they do not have the same level of authority, responsibility, and expertise as the data privacy officer in dealing with data privacy issues. References = CRISC Review Manual, 6th Edition, ISACA, 2015, page 191.

The best recommendation to reduce the risk associated with potential system compromise when a vendor stops releasing security patches and updates for a business-critical legacy system is to segment the system on its own network. Network segmentation is the process of dividing a network into smaller subnetworks or segments, based on different criteria, such as function, location, or security level. Network segmentation helps to isolate the system from the rest of the network, and limit the exposure and access to the system. Network segmentation also helps to improve the performance and security of the network, by reducing the network traffic and congestion, and enhancing the monitoring and control capabilities. The other options are not as effective as segmenting the system on its own network, although they may provide some additional protection or recovery options. Ensuring regular backups take place, virtualizing the system in the cloud, and installing antivirus software on the system are all measures that can help to reduce the risk of data loss or system damage, but they do not address the root cause of the risk, which is the lack of security patches and updates for the system. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.2.1, page 3-11.

According to the CRISC Review Manual1, a risk action plan is a document that defines the specific actions, resources, responsibilities, and timelines for implementing the risk responses. A risk action plan should be developed after the results of a vulnerability assessment are shared with the relevant stakeholders, such as the business manager, to address the identified vulnerabilities and mitigate the associated risks. Developing a risk action plan is the next step in the risk management process, as it helps to ensure that the risk responses are executed effectively and efficiently, and that the residual risks are within the acceptable levels. References = CRISC Review Manual1, page 201.