The best course of action for the risk practitioner upon learning that the number of failed back-up attempts continually exceeds the current risk threshold is to inquire about the status of any planned corrective actions.
This would help the risk practitioner to understand the root causes of the problem, the progress of the remediation efforts, and the expected timeline for resolution. It would also help the risk practitioner to provide guidance and support to the responsible parties, and to escalate the issue if necessary. Inquiring about the status of any planned corrective actions would demonstrate the risk practitioner's proactive and collaborative approach to risk management, and ensure that the risk exposure is reduced to an acceptable level as soon as possible. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 5, Section
5.2.3, page 2371

A control is an action or measure that reduces the likelihood or impact of a risk to an acceptable level. A control issue is a problem or weakness that affects the effectiveness or efficiency of a control, such as a gap, deficiency, or failure. A control enhancement is an improvement or modification that increases the effectiveness or efficiency of a control, such as by adding, replacing, or updating the control. An external audit is an independent and objective examination of the enterprise's activities, processes, or systems, such as the risk management program or the control environment, by an external party, such as a regulator or a third- party auditor. The best way for a risk practitioner to verify that management has addressed control issues identified during a previous external audit is to observe the control enhancements in operation. This will enable the risk practitioner to evaluate the actual performance and outcome of the control enhancements, and to determine whether they have resolved or mitigated the control issues. The other options are not the best way to verify that management has addressed control issues, as they involve different methods or sources of verification:
Interview control owners means that the risk practitioner asks questions or collects feedback from the persons or groups who have the authority and accountability to manage the controls and their issues, such as the business process owners or the IT controls managers. This may provide some information or evidence on the control enhancements, but it may not be as reliable or objective as observing the control enhancements in operation, as the control owners may have biases, conflicts, or gaps in their knowledge or perception of the control enhancements.
Inspect external audit documentation means that the risk practitioner reviews the reports or records of the external audit, such as the audit findings, recommendations, or opinions. This may provide some information or evidence on the control issues, but it may not be as current or relevant as observing the control enhancements in operation, as the external audit documentation may not reflect the latest or updated status or results of the control enhancements, or may not cover all the aspects or components of the control enhancements.
Review management's detailed action plans means that the risk practitioner examines the documents that specify the actions to be taken by the management to address the control issues, such as the resources required, the timelines, the owners, and the expected outcomes. This may provide some information or evidence on the control enhancements, but it may not be as accurate or sufficient as observing the control enhancements in operation, as the management's detailed action plans may not match the actual implementation or execution of the control enhancements, or may not account for the uncertainties or complexities of the control enhancements. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 2, Section 2.3.3.1, pp. 62-63.

A maturity model is a framework that describes the stages or levels of development and improvement of a certain domain, such as a process, a function, or an organization. A maturity model is most useful to an organization when it provides a reference for progress, meaning that it helps the organization to assess its current state, identify its strengths and weaknesses, set its goals and objectives, and measure itsperformance and improvement over time. A maturity model can also help the organization to compare itself with best practices and standards, but benchmarking against other organizations is not its primary purpose. A maturity model can also help the organization to manage its risks, but defining a qualitative measure of risk or providing risk metrics is not its main function. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.3.2.1, p. 118-119

Artificial intelligence (AI) is a branch of computer science that aims to create machines or systems that can perform tasks that normally require human intelligence, such as learning, reasoning, decision making, etc.
An organization that is considering adopting AI should be aware of the potential risks and challenges that may arise from using AI, such as ethical, legal, social, technical, operational, or security issues.
The most important course of action for the risk practitioner is to identify applicable risk scenarios. This means that the risk practitioner should analyze the context and objectives of the AI adoption, the stakeholders and their expectations, the data and information sources and quality, the AI models and algorithms and their reliability, the AI outputs and outcomes and their impact, and the AI governance and oversight mechanisms and their effectiveness.
Identifying applicable risk scenarios helps to assess the likelihood and impact of the risks, prioritize the risks, design and implement appropriate risk responses, monitor and evaluate the risk performance, and report and communicate the risk status and issues.
The other options are not the most important courses of action for the risk practitioner. They are either secondary or not essential for AI risk management.
The references for this answer are:
Risk IT Framework, page 24
Information Technology & Security, page 18
Risk Scenarios Starter Pack, page 16