Correct Answer: DWhen an internal auditor and the engagement client cannot reach an agreement regarding a critical issue such as the adequacy of access controls for a major system, it is important to escalate the issue to senior management for a decision. This strategy ensures that higher-level authorities consider and resolve the dispute in alignment with organizational goals and risk tolerances. Senior management has the responsibility to make final judgments on risk acceptance and control adequacy, making it the most effective way to resolve a deadlock.