Conformance with the Standards during an external assessment of the internal audit activity can be demonstrated through various means. One critical aspect is the review process of audit workpapers.
According to the IIA Standards, particularly Standard 2340 - Engagement Supervision, audit work should be reviewed by an engagement supervisor to ensure objectives are achieved, quality is maintained, and staff are developed. The review and sign-off of all audit workpapers before the issuance of the audit report (Option C) align directly with these standards, ensuring that work meets the required quality and thoroughness.
IIA Standards, Standard 2340: Engagement Supervision
IIA Quality Assurance and Improvement Program (QAIP) guidelines

Requiring contractors to submit completed and signed work acceptance sheets is an effective control to mitigate the risk of fraudulent invoices. This control provides direct evidence that the work was completed as agreed, and it offers a verifiable document that can be checked against invoices submitted. This step also ensures that any claims made by contractors can be cross-referenced easily, enhancing transparency and accountability in the billing process.
Best practices in contractor management and invoice verification.

The corporate social responsibility (CSR) strategy of accommodation is associated with responding to outside pressures by assuming additional responsibility. This strategy typically involves making adjustments and accepting responsibilities to address the concerns of external stakeholders, thereby fostering a positive relationship and enhancing the company's social license to operate.
CSR strategies and responses in corporate governance literature

According to IIA standards, the Chief Audit Executive (CAE) is responsible for confirming to the board, at least annually, the organizational independence of the internal audit activity. This is crucial for maintaining the effectiveness of the audit function and ensuring that it operates without undue influence from management, thereby allowing the board to trust in the impartiality and efficacy of the audit reports.
IIA Standard 1110.A1: "Organizational Independence"

The authority of the internal audit activity is best demonstrated through its ability to determine the scope of internal audit services. This authority, granted by the board and senior management, ensures that internal auditors have the freedom to assess and address risks appropriately across the organization without undue influence, reflecting a key element of internal audit's role in organizational governance.
IIA Standard 1110 - Organizational Independence, which emphasizes the authority of the internal audit activity to define its own scope as a critical aspect of its independence and authority.