Due professional care requires a critical review of the work done at every level of supervision. This means that professionals should carefully assess and evaluate the work performed by their subordinates or team members. By conducting a critical review, professionals can identify any errors, omissions, or inconsistencies in the work and take necessary corrective actions. This ensures that the work meets the required standards and is of high quality. It also helps in maintaining the integrity and credibility of the profession. The other options listed, such as the examination of corroborating evidence, exercising error-free judgment, and considering internal control structure, are important aspects of due professional care but are not specifically mentioned in the question.