According to the IIA Standards, an internal audit activity must have an external assessment conducted at least once every five years by a qualified, independent reviewer or review team from outside the organization. The validation by an external team ensures that the internal audit activity's self-assessments and quality assurance practices meet the required standards.
IIA Standard 1312 (External Assessments) and IIA Standard 1320 (Reporting on the Quality Assurance and Improvement Program) provide detailed guidelines for this process.

Comprehensive and Detailed Explanation:
Electronic Data Interchange (EDI) automates the structured exchange of business documents (e.g., invoices, purchase orders) between organizations without human intervention. This reduces manual processing errors and accelerates transaction flow, ensuring seamless integration with business partners.
* ERP (A) integrates internal functions but does not directly enable partner-to-partner exchange.
* MRP (B) focuses on production and material planning.
* CRM (D) manages customer relationships but not transactional data exchange.
Therefore, the best technology to reduce errors and facilitate seamless inter-organizational transactions is EDI (C).

The chief audit executive (CAE) can best illustrate the value of the internal audit activity by reporting the overall performance resulting from the internal audit balanced scorecard. The balanced scorecard includes metrics that measure the effectiveness, efficiency, and impact of the internal audit function, providing a comprehensive view of its contributions to the organization. This approach demonstrates how internal audit activities align with and support the organization's strategic objectives. References:
* The IIA's Practice Guide on Measuring Internal Audit Performance.
* The IIA's Practice Guide on Internal Audit Effectiveness.

According to IIA guidance, internal auditors should use relevant information obtained during a consulting engagement to inform and enhance their evaluation of internal controls during related audit engagements.
This is because the knowledge gained from consulting activities can provide valuable insights into the functioning of controls and processes, which can be applied when assessing their effectiveness in a subsequent audit.
IIA References:
* IIA Standard 1220: Due Professional Care indicates that internal auditors should consider all relevant information available to them when making judgments and recommendations. This includes information obtained from consulting engagements.
* The IIA's Practice Guide on Consulting Engagements advises that while internal auditors must maintain objectivity, they can and should use knowledge gained from consulting engagements to enhance the value and accuracy of their assurance work.

Workpapers from prior engagements provide context and background, especially regarding management's corrective actions and follow-up of past issues. They should inform planning, not dictate tests, scope, or risk assessment. Thus, the best benefit is understanding how prior issues were addressed, as stated in Option A.