If fraud is suspected during an audit engagement, the internal audit activity should first expand audit testing to gather sufficient and appropriate evidence to confirm or dispel the suspicion. This may involve applying additional or alternative audit procedures, such as data analysis, interviews, observations, or confirmations.

According to IIA guidance, when implementing the risk management process in a dynamic agency, it is most appropriate that the risk management process should be regularly reviewed and respond to changes in the environment to remain relevant. This principle ensures that the risk management practices are flexible and adaptive, reflecting the dynamic nature of risk within a changing organizational and external environment.
This approach is consistent with both the IIA's guidance on risk management and the principles outlined in ISO 31000.
The Institute of Internal Auditors (IIA) - Guidance on Risk Management, ISO 31000 Risk Management Guidelines.

The strategy for professional development that best demonstrates an internal auditor's competency is the creation and adherence to professional development and training plans. Such plans are tailored to the auditor's needs and goals and include a variety of learning activities and programs designed to maintain and enhance their auditing competencies. This comprehensive approach ensures continuous improvement and relevancy in the profession.
IIA's guidelines on Continuing Professional Development and standards for maintaining competency.

The most appropriate statement for a Chief Audit Executive to include in the internal audit policy manual to promote objectivity is that internal auditors should limit the scope of an engagement if they become aware of a potential impairment of their objectivity in order to reduce the potential impact of the impairment on the engagement results. This guidance helps to manage and mitigate any risks to objectivity that might affect the integrity of audit findings.
The IIA's standards and guidelines on objectivity and conflicts of interest, particularly those addressing how to handle and document potential impairments to objectivity.

According to IIA guidance on professional development, a successful mentorship program should be inclusive and beneficial for all levels of staff, from new hires to highly experienced auditors. This approach ensures continuous learning and knowledge sharing across all experience levels, thereby enhancing the overall effectiveness and cohesion of the internal audit team.
Institute of Internal Auditors (IIA) - Guidance on Continuing Professional Development and Mentorship Programs