The most appropriate match between a potential temporary guest auditor candidate and an upcoming audit assignment is a manager of social responsibility who has a nursing background to participate in a health and safety audit for the corporate office and plant facilities. This candidate's background in nursing and current role related to social responsibility aligns well with the focus of a health and safety audit, leveraging relevant experience and knowledge. References: Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)

The statement that the internal auditor may initially disagree with management's acceptance of a risk, but reevaluate and agree with management's judgment after further discussion, is true. This scenario reflects the dynamic nature of risk assessment and management discussions where the auditor, after a comprehensive evaluation and consideration of new information or perspectives, might align with management's decision regarding risk acceptance.
IIA's International Standards for the Professional Practice of Internal Auditing regarding objectivity and professional judgment.

Given the restrictions on in-person contact due to the global health crisis, a virtual meeting with management to discuss the automobile production process is the most direct and interactive alternative. This approach would allow the internal auditors to ask real-time questions and get insights directly from those who manage and understand the production process, thus compensating for the inability to conduct onsite inspections.
Institute of Internal Auditors (IIA) - Guidance on Alternative Training Methods during Disruptions.

The internal auditor's objectivity is best protected in the scenario where a former human resources manager conducts an effectiveness review of the appointment and termination process six months after transferring to the internal audit activity. This duration allows for a cooling-off period, which helps to mitigate potential conflicts of interest or biases related to the auditor's former role and responsibilities.
IIA Standards regarding objectivity and conflicts of interest.

To determine the adequacy of the control's design for adding new vendors into the vendor contract system, a flowchart of the vendor addition process would be the most useful. A flowchart provides a clear and detailed visualization of the process, highlighting each step involved and the controls in place. This allows the auditor to assess whether the design of the control is appropriate and sufficient to mitigate relevant risks. While interviews, confirmations, and cost-benefit analyses provide useful information, they do not offer the same level of detailed insight into the control's design as a flowchart does.
Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)