The best way to mitigate the risk to IT infrastructure availability is to establish a disaster recovery plan (DRP), because a DRP is a document that defines the procedures and resources needed to restore the IT infrastructure and resume the critical business functions in the event of a disaster or disruption. A DRP helps to minimize the downtime, data loss, and financial impact of a disaster, and ensures the continuity of operations and services. The other options are not the best ways to mitigate the risk to IT infrastructure availability, although they may also be helpful in supporting the DRP. Establishing recovery time objectives (RTOs), maintaining a current list of staff contact details, and maintaining a risk register are examples of planning or monitoring activities that aim to define the requirements, roles, and responsibilities for the disaster recovery process, but they do not address the actual implementation or execution of the DRP. References = CRISC: Certified in Risk & Information Systems Control Sample Questions

Failure to utilize threat modeling during the design phase results in overlooked vulnerabilities. This highlights the importance ofProactive Threat Identificationin secure software development practices.

Using a common risk taxonomy is the most important factor to consider when creating a separate IT risk register for a large organization with regard to the existing corporate risk register, as it ensures consistency, clarity, and alignment of the IT risk identification, classification, and reporting with the corporate risk management framework and strategy. Leveraging business risk professionals, relying on generic IT risk scenarios, and describing IT risk in business terms are not the most important factors, as they are more related to the resources, inputs, or outputs of the IT risk register, respectively, rather than the structure or format of the IT risk register. References = CRISC Review Manual, 7th Edition, page 100.

A threat risk assessment will best quantify the risk associated with malicious users in an organization, because it focuses on identifying and evaluating the potential sources of harm or damage to the organization's assets, such as data, systems, or networks. A malicious user is a person who intentionally and unauthorizedly accesses, modifies, destroys, or steals the organization's information or resources, for personal gain, revenge, espionage, or sabotage. A threat risk assessment can help the organization to estimate the likelihood and impact of malicious user attacks, based on factors such as the user's motivation, capability, opportunity, and access level. A threat risk assessment can also help the organization to determine the appropriate risk response strategies, such as prevention, detection, mitigation, or transfer, to reduce the risk exposure and impact of malicious user attacks. References = Risk IT Framework, ISACA, 2022, p. 141

The most useful tool for measuring the existing risk management process against a desired state is the capability maturity model, as it provides a structured and standardized way to assess the current and target levels of maturity, performance, and effectiveness of the risk management process, and to identify the gaps and improvement opportunities. The balanced scorecard, the risk management framework, and the risk scenario analysis are not the most useful tools, as they are more related to the evaluation, design, or identification of the risk management process, respectively, rather than the measurement of the risk management process. References = CRISC Review Manual, 7th Edition, page 154.