When a plant manager from within the organization is hired as a rotational internal auditor, the area he should most likely be trained for immediately is risk assessments. This training is crucial because understanding and performing risk assessments is fundamental to the internal audit function, and the plant manager may not have specific skills in this area despite having industry and management experience.References: IIA education and training standards

A hallmark of an organization with a highly effective ethical culture is the implementation and clear communication of a comprehensive code of conduct. This code provides guidance on expected behaviors and decision-making processes that align with the organization's ethical standards, thereby reinforcing a strong ethical framework within the organization.References: Institute of Internal Auditors (IIA) - Guidance on Promoting an Ethical Culture

The concept of due professional care in internal auditing involves applying the care and skill expected of a reasonably prudent and competent auditor. This includes understanding the appropriate steps and techniques for various types of engagements, including consulting engagements. Demonstrating a good understanding of the steps involved in carrying out a consulting engagement (Option C) aligns with the IIA Standard 1220: Due Professional Care, which requires internal auditors to apply the necessary care and skill in their work. This understanding is essential for executing their duties effectively and ensuring that engagements are conducted with appropriate rigor and thoroughness.References:
* IIA Standards, Standard 1220: Due Professional Care
* IIA's International Professional Practices Framework (IPPF)

The internal audit activity must align its activities with the organization's risks. Not considering high-risk development projects in the audit plan could indicate nonconformance with the Standards, specifically regarding risk-based planning. The Standards require internal audit to consider all significant risks when developing the audit plan, and failing to do so may require disclosure of nonconformance. References: The IIA's International Standards for the Professional Practice of Internal Auditing (Standards), specifically Standard 2010 - Planning, and Standard 1300 - Quality Assurance and Improvement Program.

In the scenario where an internal auditor assisted with management's design of controls over the procurement function, the chief audit executive should plan an assurance engagement on the adequacy of the internal control system by assigning the engagement to another internal auditor on staff. This approach ensures that the evaluation of the controls is conducted with objectivity and independence, as the auditor who helped design the controls may have an inherent bias.References: IIA Standards regarding objectivity and independence in assurance engagements.