This phrase from the interviewee is most likely to raise concerns regarding potential control deficiencies or fraud risks, because it indicates a lack of segregation of duties and proper backup arrangements in the purchasing process2. Segregation of duties is a key internal control that prevents or detects errors or fraud by ensuring that no single person has complete control over a transaction or activity3. Proper backup arrangements are also important to ensure that the purchasing process can continue smoothly and effectively in the absence of the department manager4. If the department manager cannot take more than a few days of vacation, it may suggest that he or she is trying to conceal some irregularities or misconduct in the purchasing process, or that there is no adequate supervision or review of his or her work5.
References:
1: Internal Audit Interview Questions & Answers - Wisdom Jobs
2: Segregation of Duties: A Key Internal Control - The CPA Journal
3: Segregation of Duties - The Institute of Internal Auditors or The IIA
4: Backup Arrangements - The Institute of Internal Auditors or The IIA
5: Fraud Prevention Checklist - The Institute of Internal Auditors or The IIA

Given the chief audit executive's (CAE) new responsibility for the risk management and compliance operations, the independence of the internal audit activity could be compromised in future audits of these functions. Therefore, to maintain objectivity and impartiality, audits of risk management and compliance functions should ideally be overseen by a competent external assurance provider. This approach ensures that the audit is free from internal influence and bias, aligning with the IIA's standards on independence and objectivity.References: IIA Standard 1110 - Organizational Independence

Due professional care involves the exercise of professional judgment and the application of care that an ordinarily prudent person would use under the circumstances. In scenario A, the chief audit executive demonstrates due professional care by excluding an auditor who previously worked in the payroll department from the audit team assigned to audit that area. This action avoids conflicts of interest and ensures the objectivity of the audit, aligning with IIA guidelines on independence and objectivity in internal auditing.
References:
* IIA Standard 1100: "Independence and Objectivity"