To manage the impairment caused by an internal auditor's personal relationship affecting audit impartiality, a functional audit committee should be utilized. The audit committee is responsible for ensuring the independence and objectivity of the internal audit function. This committee can take actions such as reassigning the audit task, reviewing the affected audit work, or instituting additional oversight for audits in that area.
The IIA's Standards on objectivity and conflicts of interest (specifically standards relating to managing impairments to independence and objectivity).

The most effective way to detect fraudulent claims for personal travel as business expenses is by reconciling claims against the business requests approved by supervisors. This method helps to verify that each claim corresponds directly to an approved and legitimate business activity, which is a critical checkpoint in detecting fraud in travel expenses.
Institute of Internal Auditors (IIA) Standards and Guidelines.

The internal audit activity's appropriate role with regard to organizational governance assurance includes assessing compliance with the organization's code of conduct. This involves evaluating whether the organization's actions align with its stated ethical standards and conduct guidelines. This role is fundamental to assurance services, ensuring that governance processes reflect and enforce the organization's values and ethical standards as outlined in its code of conduct.
IIA Standard 2110 - Governance

Exiting a product line is an example of risk avoidance. This strategy involves eliminating a specific threat or risk entirely by discontinuing the activity that generates the risk. In this context, ceasing operations of a product line effectively removes all associated risks related to that line of business.
Risk management strategies and concepts

Demonstrating due professional care involves thorough testing and evaluation of evidence. The internal auditor exhibited due professional care by selecting a sample of purchase orders above a specific threshold and obtaining documentation for each to verify compliance with the required bidding process. This methodical approach ensures that audit findings are based on sufficient, appropriate evidence and that conclusions about the effectiveness of controls are well-supported.
International Standards for the Professional Practice of Internal Auditing, particularly those related to due professional care and evidence evaluation.