According to IIA guidance, if the internal audit team lacks the necessary skills and knowledge to perform an audit, the CAE should consider obtaining external expertise. Accepting the engagement and hiring an external expert allows the internal audit activity to leverage specialized knowledge while fulfilling the audit request.
This approach ensures that the audit is conducted effectively and meets the required standards, while also addressing any competency gaps within the internal audit team.
Institute of Internal Auditors (IIA) Standards: Attribute Standards 1210: Proficiency IIA Practice Guide: Obtaining External Assistance in the Conduct of Internal Auditing

Comprehensive and Detailed Explanation:
Brainstorming (C) is a structured group technique that encourages creative idea-sharing and motivates participation. It is particularly useful when identifying fraud scenarios because it allows auditors, managers, and subject matter experts to discuss possible methods of fraud and risks in the payment process.
* A fraud risk matrix (A) is useful later for prioritization but does not generate ideas.
* Benchmarking (B) compares practices with industry peers, not internal fraud risks.
* Walkthroughs (D) help auditors understand processes but are not idea-generation tools.
Therefore, brainstorming is the most suitable approach to identify fraud scenarios in supplier payments, aligning with best practices in fraud risk assessment.

Objectives fall into three categories per COSO:
* Operations objectives: relate to efficiency, effectiveness, and safeguarding of resources.
* Compliance objectives: adherence to laws and regulations.
* Financial reporting objectives: reliability of reporting.
Verifying timely delivery of raw materials relates to operational efficiency, so the correct answer is Operations (A).

A significant governance issue that must be reported to the board is the absence of a formal risk management and control process, with risk management being solely the responsibility of operational managers. Effective governance requires a structured risk management framework overseen at the highest levels of the organization. The lack of such a process indicates a critical deficiency that can have severe implications for the organization's ability to manage and mitigate risks.
The Institute of Internal Auditors (IIA) Standard 2110 - Governance: "The internal audit activity must assess and make appropriate recommendations to improve the organization's governance processes."

The primary reason for audit supervision, including the approval of the engagement report, is to ensure that the findings presented in the report are substantiated by adequate and appropriate evidence. This step is crucial to maintain the credibility and reliability of the audit process and its outcomes.
* Substantiation of Findings: Ensuring that findings are substantiated helps in providing a clear and defensible basis for the conclusions and recommendations made in the report.
* Audit Quality: This step ensures the quality and integrity of the audit process, confirming that the evidence collected during the audit is sufficient and appropriate to support the findings.
* Credibility: By substantiating findings, the report gains credibility, which is essential for the stakeholders who rely on the audit report for decision-making.
References:
"Internal Audit Standards and Procedures," which outlines the importance of evidence substantiation in audit reports .