The control that best addresses the risk that supervisors might conceal accidents to receive bonuses is the investigation of all reported violations. This control ensures that incidents are independently verified and assessed, reducing the possibility for supervisors to manipulate or hide safety data to qualify for bonuses.
References: Best practices in fraud and misconduct control, which often emphasize the importance of independent investigations to verify compliance and enforce accountability.

In an internal audit charter, the statement most directly related to describing the responsibilities of the internal audit activity is that the Chief Audit Executive (CAE) shall report periodically on the performance of the internal audit activity relative to its plan. This statement explicitly outlines a fundamental responsibility of the CAE and the audit activity, focusing on accountability and performance measurement against the planned objectives.
IIA standards related to the roles and responsibilities included in the internal audit charter, which typically define the reporting obligations of the CAE as a reflection of the internal audit activity's duties and performance.

Having a bidding committee open the tender bids is the best control to mitigate the risk of fraud in the bidding process. This approach ensures transparency and reduces the risk of manipulative practices by involving multiple stakeholders in the bid opening, thereby preventing any single individual from influencing the outcome unduly.
Best practices in procurement and internal controls related to tender processes.

For a new board chair, the first step to ensure effective leadership involves gaining an understanding of the needs of key stakeholders. This foundational knowledge is critical as it shapes the chair's approach to governance, strategic alignment, and stakeholder engagement, providing a direct line of sight into the expectations and concerns that may influence the organization's direction.
Best governance practices and board leadership guidelines

The principle most likely violated in this scenario is objectivity. According to the IIA Code of Ethics, internal auditors must maintain an unbiased and impartial mindset in all aspects of their engagements. By considering a job offer from a business unit manager involved in an audit, the auditor risks compromising her ability to remain objective both during and after the audit process. This situation creates a conflict of interest that can influence the auditor's judgments, potentially leading to bias in audit findings or decisions.
The Institute of Internal Auditors (IIA) - Code of Ethics